Use default member initialization for raw pointers

Initialize to nullptr to prevent undefined behavior.

Change-Id: I7753c0be77a886d62ecb1cd7b86fc8c98340b0b8
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

79 files changed, 150 insertions, 150 deletions

diff --git a/examples/wayland/custom-extension/cpp-client/main.cpp b/examples/wayland/custom-extension/cpp-client/main.cpp
index da6230cc7..78eac44b9 100644
--- a/examples/wayland/custom-extension/cpp-client/main.cpp
+++ b/examples/wayland/custom-extension/cpp-client/main.cpp
@@ -148,7 +148,7 @@ protected:
     }
 
 private:
-    CustomExtension *m_extension;
+    CustomExtension *m_extension = nullptr;
     QRect rect1;
     QRect rect2;
     QRect rect3;
diff --git a/examples/wayland/minimal-cpp/compositor.h b/examples/wayland/minimal-cpp/compositor.h
index 9dd5cb2f0..2a4ab7d8e 100644
--- a/examples/wayland/minimal-cpp/compositor.h
+++ b/examples/wayland/minimal-cpp/compositor.h
@@ -92,7 +92,7 @@ private slots:
 
     void viewSurfaceDestroyed();
 private:
-    Window *m_window;
+    Window *m_window = nullptr;
     QList<View*> m_views;
 };
 
diff --git a/examples/wayland/qwindow-compositor/compositor.h b/examples/wayland/qwindow-compositor/compositor.h
index d1b501ff8..5cc3e28c6 100644
--- a/examples/wayland/qwindow-compositor/compositor.h
+++ b/examples/wayland/qwindow-compositor/compositor.h
@@ -180,10 +180,10 @@ private slots:
     void viewAnimationDone();
 private:
     View *findView(const QWaylandSurface *s) const;
-    QWindow *m_window;
+    QWindow *m_window = nullptr;
     QList<View*> m_views;
-    QWaylandWlShell *m_wlShell;
-    QWaylandXdgShellV5 *m_xdgShell;
+    QWaylandWlShell *m_wlShell = nullptr;
+    QWaylandXdgShellV5 *m_xdgShell = nullptr;
     QWaylandView m_cursorView;
     int m_cursorHotspotX;
     int m_cursorHotspotY;
diff --git a/examples/wayland/server-buffer/cpp-client/main.cpp b/examples/wayland/server-buffer/cpp-client/main.cpp
index 7ff34072b..70509d063 100644
--- a/examples/wayland/server-buffer/cpp-client/main.cpp
+++ b/examples/wayland/server-buffer/cpp-client/main.cpp
@@ -116,7 +116,7 @@ protected:
 
 private:
 
-    QOpenGLTextureBlitter *m_blitter;
+    QOpenGLTextureBlitter *m_blitter = nullptr;
     ShareBufferExtension *m_extension = nullptr;
     QList<QtWaylandClient::QWaylandServerBuffer*> m_buffers;
 
diff --git a/examples/wayland/server-buffer/cpp-client/sharebufferextension.h b/examples/wayland/server-buffer/cpp-client/sharebufferextension.h
index 6ea19c08b..1440187da 100644
--- a/examples/wayland/server-buffer/cpp-client/sharebufferextension.h
+++ b/examples/wayland/server-buffer/cpp-client/sharebufferextension.h
@@ -75,7 +75,7 @@ signals:
 
 private:
     void share_buffer_cross_buffer(struct ::qt_server_buffer *buffer) override;
-    QtWaylandClient::QWaylandServerBufferIntegration *m_server_buffer_integration;
+    QtWaylandClient::QWaylandServerBufferIntegration *m_server_buffer_integration = nullptr;
 };
 
 QT_END_NAMESPACE
diff --git a/src/client/qwaylandclipboard_p.h b/src/client/qwaylandclipboard_p.h
index 283362022..422022859 100644
--- a/src/client/qwaylandclipboard_p.h
+++ b/src/client/qwaylandclipboard_p.h
@@ -78,7 +78,7 @@ public:
     bool ownsMode(QClipboard::Mode mode) const override;
 
 private:
-    QWaylandDisplay *mDisplay;
+    QWaylandDisplay *mDisplay = nullptr;
     QMimeData m_emptyData;
 };
 
diff --git a/src/client/qwaylandcursor_p.h b/src/client/qwaylandcursor_p.h
index 916a464e4..b7b1c2a75 100644
--- a/src/client/qwaylandcursor_p.h
+++ b/src/client/qwaylandcursor_p.h
@@ -119,8 +119,8 @@ private:
 
     struct wl_cursor* requestCursor(WaylandCursor shape);
     void initCursorMap();
-    QWaylandDisplay *mDisplay;
-    struct wl_cursor_theme *mCursorTheme;
+    QWaylandDisplay *mDisplay = nullptr;
+    struct wl_cursor_theme *mCursorTheme = nullptr;
     QPoint mLastPos;
     QMap<WaylandCursor, wl_cursor *> mCursors;
     QMultiMap<WaylandCursor, QByteArray> mCursorNamesMap;
diff --git a/src/client/qwaylanddatadevice.cpp b/src/client/qwaylanddatadevice.cpp
index 4411ba65c..300c9de0a 100644
--- a/src/client/qwaylanddatadevice.cpp
+++ b/src/client/qwaylanddatadevice.cpp
@@ -203,7 +203,7 @@ void QWaylandDataDevice::data_device_motion(uint32_t time, wl_fixed_t x, wl_fixe
 
     m_dragPoint = calculateDragPosition(x, y, m_dragWindow);
 
-    QMimeData *dragData;
+    QMimeData *dragData = nullptr;
     Qt::DropActions supportedActions;
     if (drag) {
         dragData = drag->mimeData();
diff --git a/src/client/qwaylanddatadevicemanager_p.h b/src/client/qwaylanddatadevicemanager_p.h
index 3daf780aa..10df1bca9 100644
--- a/src/client/qwaylanddatadevicemanager_p.h
+++ b/src/client/qwaylanddatadevicemanager_p.h
@@ -76,7 +76,7 @@ public:
     QWaylandDisplay *display() const;
 
 private:
-    QWaylandDisplay *m_display;
+    QWaylandDisplay *m_display = nullptr;
 };
 
 }
diff --git a/src/client/qwaylanddataoffer_p.h b/src/client/qwaylanddataoffer_p.h
index c9b9c21f1..932506bf5 100644
--- a/src/client/qwaylanddataoffer_p.h
+++ b/src/client/qwaylanddataoffer_p.h
@@ -98,8 +98,8 @@ protected:
 private:
     int readData(int fd, QByteArray &data) const;
 
-    mutable QWaylandDataOffer *m_dataOffer;
-    QWaylandDisplay *m_display;
+    mutable QWaylandDataOffer *m_dataOffer = nullptr;
+    QWaylandDisplay *m_display = nullptr;
     mutable QStringList m_types;
     mutable QHash<QString, QByteArray> m_data;
 };
diff --git a/src/client/qwaylanddatasource_p.h b/src/client/qwaylanddatasource_p.h
index bba003f56..a79cdcbfa 100644
--- a/src/client/qwaylanddatasource_p.h
+++ b/src/client/qwaylanddatasource_p.h
@@ -86,8 +86,8 @@ protected:
     void data_source_target(const QString &mime_type) override;
 
 private:
-    QWaylandDisplay *m_display;
-    QMimeData *m_mime_data;
+    QWaylandDisplay *m_display = nullptr;
+    QMimeData *m_mime_data = nullptr;
 };
 
 }
diff --git a/src/client/qwaylanddisplay_p.h b/src/client/qwaylanddisplay_p.h
index 0a7ea427a..dbcc2112f 100644
--- a/src/client/qwaylanddisplay_p.h
+++ b/src/client/qwaylanddisplay_p.h
@@ -149,7 +149,7 @@ public:
         uint32_t id;
         QString interface;
         uint32_t version;
-        struct ::wl_registry *registry;
+        struct ::wl_registry *registry = nullptr;
         RegistryGlobal(uint32_t id_, const QString &interface_, uint32_t version_, struct ::wl_registry *registry_)
             : id(id_), interface(interface_), version(version_), registry(registry_) { }
     };
@@ -191,17 +191,17 @@ private:
     void requestWaylandSync();
 
     struct Listener {
-        RegistryListener listener;
-        void *data;
+        RegistryListener listener = nullptr;
+        void *data = nullptr;
     };
 
-    struct wl_display *mDisplay;
+    struct wl_display *mDisplay = nullptr;
     QtWayland::wl_compositor mCompositor;
     QScopedPointer<QWaylandShm> mShm;
     QList<QWaylandScreen *> mScreens;
     QList<QWaylandInputDevice *> mInputDevices;
     QList<Listener> mRegistryListeners;
-    QWaylandIntegration *mWaylandIntegration;
+    QWaylandIntegration *mWaylandIntegration = nullptr;
 #if QT_CONFIG(wayland_datadevice)
     QScopedPointer<QWaylandDataDeviceManager> mDndSelectionHandler;
 #endif
@@ -212,7 +212,7 @@ private:
     QScopedPointer<QWaylandWindowManagerIntegration> mWindowManagerIntegration;
     QScopedPointer<QtWayland::zwp_text_input_manager_v2> mTextInputManager;
     QScopedPointer<QWaylandHardwareIntegration> mHardwareIntegration;
-    QSocketNotifier *mReadNotifier;
+    QSocketNotifier *mReadNotifier = nullptr;
     int mFd;
     int mWritableNotificationFd;
     QList<RegistryGlobal> mGlobals;
diff --git a/src/client/qwaylanddnd_p.h b/src/client/qwaylanddnd_p.h
index 8a1d7f1f1..0f14eb00b 100644
--- a/src/client/qwaylanddnd_p.h
+++ b/src/client/qwaylanddnd_p.h
@@ -84,7 +84,7 @@ protected:
 
 
 private:
-    QWaylandDisplay *m_display;
+    QWaylandDisplay *m_display = nullptr;
 };
 #endif
 }
diff --git a/src/client/qwaylandextendedsurface_p.h b/src/client/qwaylandextendedsurface_p.h
index 02700b290..dffd04281 100644
--- a/src/client/qwaylandextendedsurface_p.h
+++ b/src/client/qwaylandextendedsurface_p.h
@@ -83,7 +83,7 @@ private:
     void extended_surface_set_generic_property(const QString &name, wl_array *value) override;
     void extended_surface_close() override;
 
-    QWaylandWindow *m_window;
+    QWaylandWindow *m_window = nullptr;
     QVariantMap m_properties;
 };
 
diff --git a/src/client/qwaylandinputcontext_p.h b/src/client/qwaylandinputcontext_p.h
index a554f2301..cbb2e18dc 100644
--- a/src/client/qwaylandinputcontext_p.h
+++ b/src/client/qwaylandinputcontext_p.h
@@ -107,7 +107,7 @@ protected:
 private:
     Qt::KeyboardModifiers modifiersToQtModifiers(uint32_t modifiers);
 
-    QWaylandDisplay *m_display;
+    QWaylandDisplay *m_display = nullptr;
     QWaylandInputMethodEventBuilder m_builder;
 
     QVector<Qt::KeyboardModifier> m_modifiersMap;
@@ -155,7 +155,7 @@ public:
 private:
     QWaylandTextInput *textInput() const;
 
-    QWaylandDisplay *mDisplay;
+    QWaylandDisplay *mDisplay = nullptr;
     QPointer<QWindow> mCurrentWindow;
 };
 
diff --git a/src/client/qwaylandinputdevice_p.h b/src/client/qwaylandinputdevice_p.h
index 8a02769e3..2c7d2cffd 100644
--- a/src/client/qwaylandinputdevice_p.h
+++ b/src/client/qwaylandinputdevice_p.h
@@ -143,13 +143,13 @@ public:
 private:
     void setCursor(Qt::CursorShape cursor, QWaylandScreen *screen);
 
-    QWaylandDisplay *mQDisplay;
-    struct wl_display *mDisplay;
+    QWaylandDisplay *mQDisplay = nullptr;
+    struct wl_display *mDisplay = nullptr;
 
     int mVersion;
     uint32_t mCaps = 0;
 
-    struct wl_surface *pointerSurface;
+    struct wl_surface *pointerSurface = nullptr;
 
 #if QT_CONFIG(wayland_datadevice)
     QWaylandDataDevice *mDataDevice = nullptr;
@@ -207,7 +207,7 @@ public:
                             uint32_t mods_locked,
                             uint32_t group) override;
 
-    QWaylandInputDevice *mParent;
+    QWaylandInputDevice *mParent = nullptr;
     QPointer<QWaylandWindow> mFocus;
 #if QT_CONFIG(xkbcommon_evdev)
     xkb_context *mXkbContext = nullptr;
@@ -262,7 +262,7 @@ public:
 
     void releaseButtons();
 
-    QWaylandInputDevice *mParent;
+    QWaylandInputDevice *mParent = nullptr;
     QPointer<QWaylandWindow> mFocus;
     uint32_t mEnterSerial = 0;
 #if QT_CONFIG(cursor)
@@ -302,7 +302,7 @@ public:
     bool allTouchPointsReleased();
     void releasePoints();
 
-    QWaylandInputDevice *mParent;
+    QWaylandInputDevice *mParent = nullptr;
     QPointer<QWaylandWindow> mFocus;
     QList<QWindowSystemInterface::TouchPoint> mTouchPoints;
     QList<QWindowSystemInterface::TouchPoint> mPrevTouchPoints;
diff --git a/src/client/qwaylandnativeinterface_p.h b/src/client/qwaylandnativeinterface_p.h
index c83180c09..3de80eb6a 100644
--- a/src/client/qwaylandnativeinterface_p.h
+++ b/src/client/qwaylandnativeinterface_p.h
@@ -85,7 +85,7 @@ public:
     QFunctionPointer platformFunction(const QByteArray &resource) const override;
 
 private:
-    QWaylandIntegration *m_integration;
+    QWaylandIntegration *m_integration = nullptr;
     QHash<QPlatformWindow*, QVariantMap> m_windowProperties;
 
     static void setSync(QWindow *window);
diff --git a/src/client/qwaylandqtkey_p.h b/src/client/qwaylandqtkey_p.h
index 3374b907a..9091cf819 100644
--- a/src/client/qwaylandqtkey_p.h
+++ b/src/client/qwaylandqtkey_p.h
@@ -68,7 +68,7 @@ public:
     QWaylandQtKeyExtension(QWaylandDisplay *display, uint32_t id);
 
 private:
-    QWaylandDisplay *m_display;
+    QWaylandDisplay *m_display = nullptr;
 
     void key_extension_qtkey(struct wl_surface *surface,
                              uint32_t time,
diff --git a/src/client/qwaylandshellsurface_p.h b/src/client/qwaylandshellsurface_p.h
index 06d92ba08..3a725d822 100644
--- a/src/client/qwaylandshellsurface_p.h
+++ b/src/client/qwaylandshellsurface_p.h
@@ -104,7 +104,7 @@ protected:
     virtual void setMinimized() {}
 
 private:
-    QWaylandWindow *m_window;
+    QWaylandWindow *m_window = nullptr;
     friend class QWaylandWindow;
 };
 
diff --git a/src/client/qwaylandsubsurface_p.h b/src/client/qwaylandsubsurface_p.h
index 36a92a755..a9fd76a88 100644
--- a/src/client/qwaylandsubsurface_p.h
+++ b/src/client/qwaylandsubsurface_p.h
@@ -86,8 +86,8 @@ private:
     // to keep track of the sync state
     void set_sync();
     void set_desync();
-    QWaylandWindow *m_window;
-    QWaylandWindow *m_parent;
+    QWaylandWindow *m_window = nullptr;
+    QWaylandWindow *m_parent = nullptr;
     bool m_synchronized = false;
     QMutex m_syncLock;
 
diff --git a/src/client/qwaylandtouch_p.h b/src/client/qwaylandtouch_p.h
index 7d909769d..93a829e21 100644
--- a/src/client/qwaylandtouch_p.h
+++ b/src/client/qwaylandtouch_p.h
@@ -73,7 +73,7 @@ public:
 private:
     void registerDevice(int caps);
 
-    QWaylandDisplay *mDisplay;
+    QWaylandDisplay *mDisplay = nullptr;
 
     void touch_extension_touch(uint32_t time,
                                uint32_t id,
@@ -95,15 +95,15 @@ private:
 
     QList<QWindowSystemInterface::TouchPoint> mTouchPoints;
     QList<QWindowSystemInterface::TouchPoint> mPrevTouchPoints;
-    QTouchDevice *mTouchDevice;
+    QTouchDevice *mTouchDevice = nullptr;
     uint32_t mTimestamp;
     int mPointsLeft;
     uint32_t mFlags;
     int mMouseSourceId;
     QPointF mLastMouseLocal;
     QPointF mLastMouseGlobal;
-    QWindow *mTargetWindow;
-    QWaylandInputDevice *mInputDevice;
+    QWindow *mTargetWindow = nullptr;
+    QWaylandInputDevice *mInputDevice = nullptr;
 };
 
 }
diff --git a/src/client/qwaylandwindowmanagerintegration.cpp b/src/client/qwaylandwindowmanagerintegration.cpp
index 785a0a44d..17ae8a5ae 100644
--- a/src/client/qwaylandwindowmanagerintegration.cpp
+++ b/src/client/qwaylandwindowmanagerintegration.cpp
@@ -61,7 +61,7 @@ class QWaylandWindowManagerIntegrationPrivate {
 public:
     QWaylandWindowManagerIntegrationPrivate(QWaylandDisplay *waylandDisplay);
     bool m_blockPropertyUpdates = false;
-    QWaylandDisplay *m_waylandDisplay;
+    QWaylandDisplay *m_waylandDisplay = nullptr;
     QHash<QWindow*, QVariantMap> m_queuedProperties;
     bool m_showIsFullScreen = false;
 };
diff --git a/src/client/qwaylandwlshellsurface_p.h b/src/client/qwaylandwlshellsurface_p.h
index 708c6f113..b0e677951 100644
--- a/src/client/qwaylandwlshellsurface_p.h
+++ b/src/client/qwaylandwlshellsurface_p.h
@@ -104,7 +104,7 @@ private:
     void updateTransientParent(QWindow *parent);
     void setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, uint serial);
 
-    QWaylandWindow *m_window;
+    QWaylandWindow *m_window = nullptr;
     bool m_maximized = false;
     bool m_fullscreen = false;
     QSize m_size;
diff --git a/src/client/qwaylandxdgpopup_p.h b/src/client/qwaylandxdgpopup_p.h
index 85bd589bf..74c0dca26 100644
--- a/src/client/qwaylandxdgpopup_p.h
+++ b/src/client/qwaylandxdgpopup_p.h
@@ -81,7 +81,7 @@ protected:
 
 private:
     QWaylandExtendedSurface *m_extendedWindow = nullptr;
-    QWaylandWindow *m_window;
+    QWaylandWindow *m_window = nullptr;
 };
 
 QT_END_NAMESPACE
diff --git a/src/client/qwaylandxdgshellv6_p.h b/src/client/qwaylandxdgshellv6_p.h
index 122beed0c..e59a67d69 100644
--- a/src/client/qwaylandxdgshellv6_p.h
+++ b/src/client/qwaylandxdgshellv6_p.h
@@ -106,7 +106,7 @@ private:
             QVarLengthArray<uint32_t> states;
         } m_configureState;
 
-        QWaylandXdgSurfaceV6 *m_xdgSurface;
+        QWaylandXdgSurfaceV6 *m_xdgSurface = nullptr;
     };
 
     class Popup : public QtWayland::zxdg_popup_v6 {
@@ -117,14 +117,14 @@ private:
         void applyConfigure();
         void zxdg_popup_v6_popup_done() override;
 
-        QWaylandXdgSurfaceV6 *m_xdgSurface;
+        QWaylandXdgSurfaceV6 *m_xdgSurface = nullptr;
     };
 
     void setToplevel();
     void setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, int serial, bool grab);
 
-    QWaylandXdgShellV6 *m_shell;
-    QWaylandWindow *m_window;
+    QWaylandXdgShellV6 *m_shell = nullptr;
+    QWaylandWindow *m_window = nullptr;
     Toplevel *m_toplevel = nullptr;
     Popup *m_popup = nullptr;
     bool m_configured = false;
diff --git a/src/client/qwaylandxdgsurface_p.h b/src/client/qwaylandxdgsurface_p.h
index fa7963206..42846c665 100644
--- a/src/client/qwaylandxdgsurface_p.h
+++ b/src/client/qwaylandxdgsurface_p.h
@@ -110,8 +110,8 @@ private:
     void updateTransientParent(QWaylandWindow *parent);
 
 private:
-    QWaylandWindow *m_window;
-    QWaylandXdgShell* m_shell;
+    QWaylandWindow *m_window = nullptr;
+    QWaylandXdgShell* m_shell = nullptr;
     bool m_maximized = false;
     bool m_minimized = false;
     bool m_fullscreen = false;
diff --git a/src/client/shellintegration/qwaylandshellintegration_p.h b/src/client/shellintegration/qwaylandshellintegration_p.h
index ab9b736bb..7f3a2cefc 100644
--- a/src/client/shellintegration/qwaylandshellintegration_p.h
+++ b/src/client/shellintegration/qwaylandshellintegration_p.h
@@ -81,7 +81,7 @@ public:
     }
 
 protected:
-    QWaylandDisplay *m_display;
+    QWaylandDisplay *m_display = nullptr;
 };
 
 }
diff --git a/src/compositor/compositor_api/qwaylandbufferref.cpp b/src/compositor/compositor_api/qwaylandbufferref.cpp
index affd7af33..82997a5d3 100644
--- a/src/compositor/compositor_api/qwaylandbufferref.cpp
+++ b/src/compositor/compositor_api/qwaylandbufferref.cpp
@@ -48,7 +48,7 @@ QT_BEGIN_NAMESPACE
 class QWaylandBufferRefPrivate
 {
 public:
-    QtWayland::ClientBuffer *buffer;
+    QtWayland::ClientBuffer *buffer = nullptr;
 
     bool nullOrDestroyed() {
         return !buffer || buffer->isDestroyed();
diff --git a/src/compositor/compositor_api/qwaylandclient.cpp b/src/compositor/compositor_api/qwaylandclient.cpp
index 471c1b5a1..bde24be1d 100644
--- a/src/compositor/compositor_api/qwaylandclient.cpp
+++ b/src/compositor/compositor_api/qwaylandclient.cpp
@@ -73,8 +73,8 @@ public:
         delete client;
     }
 
-    QWaylandCompositor *compositor;
-    wl_client *client;
+    QWaylandCompositor *compositor = nullptr;
+    wl_client *client = nullptr;
 
     uid_t uid;
     gid_t gid;
@@ -82,7 +82,7 @@ public:
 
     struct Listener {
         wl_listener listener;
-        QWaylandClient *parent;
+        QWaylandClient *parent = nullptr;
     };
     Listener listener;
 };
diff --git a/src/compositor/compositor_api/qwaylandcompositor.cpp b/src/compositor/compositor_api/qwaylandcompositor.cpp
index ae5ed1ec1..8c476cf1c 100644
--- a/src/compositor/compositor_api/qwaylandcompositor.cpp
+++ b/src/compositor/compositor_api/qwaylandcompositor.cpp
@@ -142,7 +142,7 @@ public:
         return true;
     }
 
-    QWaylandCompositor *compositor;
+    QWaylandCompositor *compositor = nullptr;
 };
 
 } // namespace
@@ -284,7 +284,7 @@ void QWaylandCompositorPrivate::compositor_create_surface(wl_compositor::Resourc
 #endif
     struct wl_resource *surfResource = wl_client_get_object(client->client(), id);
 
-    QWaylandSurface *surface;
+    QWaylandSurface *surface = nullptr;
     if (surfResource) {
         surface = QWaylandSurface::fromResource(surfResource);
     } else {
diff --git a/src/compositor/compositor_api/qwaylandcompositor_p.h b/src/compositor/compositor_api/qwaylandcompositor_p.h
index b1959e68f..340860a94 100644
--- a/src/compositor/compositor_api/qwaylandcompositor_p.h
+++ b/src/compositor/compositor_api/qwaylandcompositor_p.h
@@ -136,13 +136,13 @@ protected:
     QList<QWaylandSurface *> all_surfaces;
 
 #if QT_CONFIG(wayland_datadevice)
-    QtWayland::DataDeviceManager *data_device_manager;
+    QtWayland::DataDeviceManager *data_device_manager = nullptr;
 #endif
-    QtWayland::BufferManager *buffer_manager;
+    QtWayland::BufferManager *buffer_manager = nullptr;
 
     QElapsedTimer timer;
 
-    wl_event_loop *loop;
+    wl_event_loop *loop = nullptr;
 
     QList<QWaylandClient *> clients;
 
diff --git a/src/compositor/compositor_api/qwaylanddestroylistener_p.h b/src/compositor/compositor_api/qwaylanddestroylistener_p.h
index 0cc10dca6..7c6001c36 100644
--- a/src/compositor/compositor_api/qwaylanddestroylistener_p.h
+++ b/src/compositor/compositor_api/qwaylanddestroylistener_p.h
@@ -70,7 +70,7 @@ public:
 
     struct Listener {
         wl_listener listener;
-        QWaylandDestroyListenerPrivate *parent;
+        QWaylandDestroyListenerPrivate *parent = nullptr;
     };
     Listener listener;
 };
diff --git a/src/compositor/compositor_api/qwaylanddrag.cpp b/src/compositor/compositor_api/qwaylanddrag.cpp
index 34f936a56..d79e4fa30 100644
--- a/src/compositor/compositor_api/qwaylanddrag.cpp
+++ b/src/compositor/compositor_api/qwaylanddrag.cpp
@@ -69,7 +69,7 @@ public:
         return QWaylandSeatPrivate::get(seat)->dataDevice();
     }
 
-    QWaylandSeat *seat;
+    QWaylandSeat *seat = nullptr;
 };
 
 QWaylandDrag::QWaylandDrag(QWaylandSeat *seat)
diff --git a/src/compositor/compositor_api/qwaylandquickcompositor.cpp b/src/compositor/compositor_api/qwaylandquickcompositor.cpp
index 35cd49228..8e8a903e3 100644
--- a/src/compositor/compositor_api/qwaylandquickcompositor.cpp
+++ b/src/compositor/compositor_api/qwaylandquickcompositor.cpp
@@ -135,7 +135,7 @@ void QWaylandQuickCompositor::grabSurface(QWaylandSurfaceGrabber *grabber, const
     class GrabState : public QRunnable
     {
     public:
-        QWaylandSurfaceGrabber *grabber;
+        QWaylandSurfaceGrabber *grabber = nullptr;
         QWaylandBufferRef buffer;
 
         void run() override
diff --git a/src/compositor/compositor_api/qwaylandsurface.cpp b/src/compositor/compositor_api/qwaylandsurface.cpp
index ed9bef3cf..4d2676661 100644
--- a/src/compositor/compositor_api/qwaylandsurface.cpp
+++ b/src/compositor/compositor_api/qwaylandsurface.cpp
@@ -109,8 +109,8 @@ public:
             QWaylandSurfacePrivate::get(_this->surface)->removeFrameCallback(_this);
         delete _this;
     }
-    QWaylandSurface *surface;
-    wl_resource *resource;
+    QWaylandSurface *surface = nullptr;
+    wl_resource *resource = nullptr;
     bool canSend = false;
 };
 }
diff --git a/src/compositor/compositor_api/qwaylandsurface_p.h b/src/compositor/compositor_api/qwaylandsurface_p.h
index 3dc9bf20e..9d4a3b03d 100644
--- a/src/compositor/compositor_api/qwaylandsurface_p.h
+++ b/src/compositor/compositor_api/qwaylandsurface_p.h
@@ -193,8 +193,8 @@ public: //member variables
 
     private:
         friend class QWaylandSurfacePrivate;
-        QWaylandSurfacePrivate *surface;
-        QWaylandSurfacePrivate *parentSurface;
+        QWaylandSurfacePrivate *surface = nullptr;
+        QWaylandSurfacePrivate *parentSurface = nullptr;
         QPoint position;
     };
 
diff --git a/src/compositor/compositor_api/qwaylandsurfacegrabber.cpp b/src/compositor/compositor_api/qwaylandsurfacegrabber.cpp
index 7540437ac..5db576221 100644
--- a/src/compositor/compositor_api/qwaylandsurfacegrabber.cpp
+++ b/src/compositor/compositor_api/qwaylandsurfacegrabber.cpp
@@ -73,7 +73,7 @@ class QWaylandSurfaceGrabberPrivate : public QObjectPrivate
 {
     Q_DECLARE_PUBLIC(QWaylandSurfaceGrabber)
 
-    QWaylandSurface *surface;
+    QWaylandSurface *surface = nullptr;
 };
 
 /*!
diff --git a/src/compositor/compositor_api/qwaylandtouch_p.h b/src/compositor/compositor_api/qwaylandtouch_p.h
index f29933c78..de1b748de 100644
--- a/src/compositor/compositor_api/qwaylandtouch_p.h
+++ b/src/compositor/compositor_api/qwaylandtouch_p.h
@@ -81,7 +81,7 @@ public:
 private:
     void touch_release(Resource *resource) override;
 
-    QWaylandSeat *seat;
+    QWaylandSeat *seat = nullptr;
 };
 
 QT_END_NAMESPACE
diff --git a/src/compositor/extensions/qwaylandivisurfaceintegration_p.h b/src/compositor/extensions/qwaylandivisurfaceintegration_p.h
index 7825cabda..a28bd6de6 100644
--- a/src/compositor/extensions/qwaylandivisurfaceintegration_p.h
+++ b/src/compositor/extensions/qwaylandivisurfaceintegration_p.h
@@ -70,8 +70,8 @@ private Q_SLOTS:
     void handleIviSurfaceDestroyed();
 
 private:
-    QWaylandQuickShellSurfaceItem *m_item;
-    QWaylandIviSurface *m_shellSurface;
+    QWaylandQuickShellSurfaceItem *m_item = nullptr;
+    QWaylandIviSurface *m_shellSurface = nullptr;
 };
 
 }
diff --git a/src/compositor/extensions/qwaylandwlshellintegration_p.h b/src/compositor/extensions/qwaylandwlshellintegration_p.h
index 7b9569122..19ee07b80 100644
--- a/src/compositor/extensions/qwaylandwlshellintegration_p.h
+++ b/src/compositor/extensions/qwaylandwlshellintegration_p.h
@@ -92,16 +92,16 @@ private:
     void handlePopupRemoved();
     qreal devicePixelRatio() const;
 
-    QWaylandQuickShellSurfaceItem *m_item;
+    QWaylandQuickShellSurfaceItem *m_item = nullptr;
     QPointer<QWaylandWlShellSurface> m_shellSurface;
     GrabberState grabberState = GrabberState::Default;
     struct {
-        QWaylandSeat *seat;
+        QWaylandSeat *seat = nullptr;
         QPointF initialOffset;
         bool initialized;
     } moveState;
     struct {
-        QWaylandSeat *seat;
+        QWaylandSeat *seat = nullptr;
         QWaylandWlShellSurface::ResizeEdge resizeEdges;
         QSizeF initialSize;
         QPointF initialMousePos;
diff --git a/src/compositor/extensions/qwaylandxdgshellv5integration_p.h b/src/compositor/extensions/qwaylandxdgshellv5integration_p.h
index 7ca04c029..271a5b257 100644
--- a/src/compositor/extensions/qwaylandxdgshellv5integration_p.h
+++ b/src/compositor/extensions/qwaylandxdgshellv5integration_p.h
@@ -84,18 +84,18 @@ private:
         Resize,
         Move
     };
-    QWaylandQuickShellSurfaceItem *m_item;
-    QWaylandXdgSurfaceV5 *m_xdgSurface;
+    QWaylandQuickShellSurfaceItem *m_item = nullptr;
+    QWaylandXdgSurfaceV5 *m_xdgSurface = nullptr;
 
     GrabberState grabberState;
     struct {
-        QWaylandSeat *seat;
+        QWaylandSeat *seat = nullptr;
         QPointF initialOffset;
         bool initialized;
     } moveState;
 
     struct {
-        QWaylandSeat *seat;
+        QWaylandSeat *seat = nullptr;
         QWaylandXdgSurfaceV5::ResizeEdge resizeEdges;
         QSizeF initialWindowSize;
         QPointF initialMousePos;
@@ -121,9 +121,9 @@ private Q_SLOTS:
     void handlePopupDestroyed();
 
 private:
-    QWaylandQuickShellSurfaceItem *m_item;
-    QWaylandXdgPopupV5 *m_xdgPopup;
-    QWaylandXdgShellV5 *m_xdgShell;
+    QWaylandQuickShellSurfaceItem *m_item = nullptr;
+    QWaylandXdgPopupV5 *m_xdgPopup = nullptr;
+    QWaylandXdgShellV5 *m_xdgShell = nullptr;
 };
 
 }
diff --git a/src/compositor/extensions/qwaylandxdgshellv6_p.h b/src/compositor/extensions/qwaylandxdgshellv6_p.h
index 191a936f9..6feb95060 100644
--- a/src/compositor/extensions/qwaylandxdgshellv6_p.h
+++ b/src/compositor/extensions/qwaylandxdgshellv6_p.h
@@ -168,7 +168,7 @@ protected:
     void zxdg_toplevel_v6_set_minimized(Resource *resource) override;
 
 public:
-    QWaylandXdgSurfaceV6 *m_xdgSurface;
+    QWaylandXdgSurfaceV6 *m_xdgSurface = nullptr;
     QWaylandXdgToplevelV6 *m_parentToplevel = nullptr;
     QList<ConfigureEvent> m_pendingConfigures;
     ConfigureEvent m_lastAckedConfigure;
@@ -206,8 +206,8 @@ protected:
     void zxdg_popup_v6_grab(Resource *resource, struct ::wl_resource *seat, uint32_t serial) override;
 
 private:
-    QWaylandXdgSurfaceV6 *m_xdgSurface;
-    QWaylandXdgSurfaceV6 *m_parentXdgSurface;
+    QWaylandXdgSurfaceV6 *m_xdgSurface = nullptr;
+    QWaylandXdgSurfaceV6 *m_parentXdgSurface = nullptr;
     QWaylandXdgPositionerV6Data m_positionerData;
     QRect m_geometry;
     QList<ConfigureEvent> m_pendingConfigures;
diff --git a/src/compositor/extensions/qwaylandxdgshellv6integration_p.h b/src/compositor/extensions/qwaylandxdgshellv6integration_p.h
index 36dd21b6c..4ccabfa98 100644
--- a/src/compositor/extensions/qwaylandxdgshellv6integration_p.h
+++ b/src/compositor/extensions/qwaylandxdgshellv6integration_p.h
@@ -76,9 +76,9 @@ private Q_SLOTS:
     void handleSurfaceSizeChanged();
 
 private:
-    QWaylandQuickShellSurfaceItem *m_item;
-    QWaylandXdgSurfaceV6 *m_xdgSurface;
-    QWaylandXdgToplevelV6 *m_toplevel;
+    QWaylandQuickShellSurfaceItem *m_item = nullptr;
+    QWaylandXdgSurfaceV6 *m_xdgSurface = nullptr;
+    QWaylandXdgToplevelV6 *m_toplevel = nullptr;
 
     enum class GrabberState {
         Default,
@@ -88,13 +88,13 @@ private:
     GrabberState grabberState;
 
     struct {
-        QWaylandSeat *seat;
+        QWaylandSeat *seat = nullptr;
         QPointF initialOffset;
         bool initialized;
     } moveState;
 
     struct {
-        QWaylandSeat *seat;
+        QWaylandSeat *seat = nullptr;
         Qt::Edges resizeEdges;
         QSizeF initialWindowSize;
         QPointF initialMousePos;
@@ -119,9 +119,9 @@ private Q_SLOTS:
     void handleGeometryChanged();
 
 private:
-    QWaylandQuickShellSurfaceItem *m_item;
-    QWaylandXdgSurfaceV6 *m_xdgSurface;
-    QWaylandXdgPopupV6 *m_popup;
+    QWaylandQuickShellSurfaceItem *m_item = nullptr;
+    QWaylandXdgSurfaceV6 *m_xdgSurface = nullptr;
+    QWaylandXdgPopupV6 *m_popup = nullptr;
 };
 
 }
diff --git a/src/compositor/extensions/qwlqtkey_p.h b/src/compositor/extensions/qwlqtkey_p.h
index fae02b0c2..d3f573757 100644
--- a/src/compositor/extensions/qwlqtkey_p.h
+++ b/src/compositor/extensions/qwlqtkey_p.h
@@ -73,7 +73,7 @@ public:
     bool postQtKeyEvent(QKeyEvent *event, QWaylandSurface *surface);
 
 private:
-    QWaylandCompositor *m_compositor;
+    QWaylandCompositor *m_compositor = nullptr;
 };
 
 }
diff --git a/src/compositor/extensions/qwlqttouch_p.h b/src/compositor/extensions/qwlqttouch_p.h
index 3f046a576..1a22e0808 100644
--- a/src/compositor/extensions/qwlqttouch_p.h
+++ b/src/compositor/extensions/qwlqttouch_p.h
@@ -93,7 +93,7 @@ protected:
     void touch_extension_destroy_resource(Resource *resource) override;
 
 private:
-    QWaylandCompositor *m_compositor;
+    QWaylandCompositor *m_compositor = nullptr;
     BehaviorFlags m_flags = BehaviorFlag::None;
     QList<Resource *> m_resources;
     QVector<float> m_posData;
diff --git a/src/compositor/wayland_wrapper/qwlbuffermanager_p.h b/src/compositor/wayland_wrapper/qwlbuffermanager_p.h
index c1f907ff5..9243e36ea 100644
--- a/src/compositor/wayland_wrapper/qwlbuffermanager_p.h
+++ b/src/compositor/wayland_wrapper/qwlbuffermanager_p.h
@@ -71,7 +71,7 @@ private:
     static void destroy_listener_callback(wl_listener *listener, void *data);
 
     QHash<struct ::wl_resource *, ClientBuffer*> m_buffers;
-    QWaylandCompositor *m_compositor;
+    QWaylandCompositor *m_compositor = nullptr;
 };
 
 }
diff --git a/src/compositor/wayland_wrapper/qwlclientbuffer_p.h b/src/compositor/wayland_wrapper/qwlclientbuffer_p.h
index 5f3475ed7..ac8c1ed01 100644
--- a/src/compositor/wayland_wrapper/qwlclientbuffer_p.h
+++ b/src/compositor/wayland_wrapper/qwlclientbuffer_p.h
@@ -73,7 +73,7 @@ namespace QtWayland {
 struct surface_buffer_destroy_listener
 {
     struct wl_listener listener;
-    class ClientBuffer *surfaceBuffer;
+    class ClientBuffer *surfaceBuffer = nullptr;
 };
 
 class Q_WAYLAND_COMPOSITOR_EXPORT ClientBuffer
@@ -112,7 +112,7 @@ protected:
     void sendRelease();
     void setDestroyed();
 
-    struct ::wl_resource *m_buffer;
+    struct ::wl_resource *m_buffer = nullptr;
     QRegion m_damage;
     bool m_textureDirty = false;
 
diff --git a/src/compositor/wayland_wrapper/qwldatadevice_p.h b/src/compositor/wayland_wrapper/qwldatadevice_p.h
index 4cb492509..8d27f41c2 100644
--- a/src/compositor/wayland_wrapper/qwldatadevice_p.h
+++ b/src/compositor/wayland_wrapper/qwldatadevice_p.h
@@ -96,8 +96,8 @@ private:
     void setDragIcon(QWaylandSurface *icon);
 #endif
 
-    QWaylandCompositor *m_compositor;
-    QWaylandSeat *m_seat;
+    QWaylandCompositor *m_compositor = nullptr;
+    QWaylandSeat *m_seat = nullptr;
 
     DataSource *m_selectionSource = nullptr;
 
diff --git a/src/compositor/wayland_wrapper/qwldatadevicemanager_p.h b/src/compositor/wayland_wrapper/qwldatadevicemanager_p.h
index 9c6672db6..eca6d4b54 100644
--- a/src/compositor/wayland_wrapper/qwldatadevicemanager_p.h
+++ b/src/compositor/wayland_wrapper/qwldatadevicemanager_p.h
@@ -101,7 +101,7 @@ private:
     void retain();
     void finishReadFromClient(bool exhausted = false);
 
-    QWaylandCompositor *m_compositor;
+    QWaylandCompositor *m_compositor = nullptr;
     QList<DataDevice *> m_data_device_list;
 
     DataSource *m_current_selection_source = nullptr;
diff --git a/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglintegration.h b/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglintegration.h
index 8d89ebf74..651400d87 100644
--- a/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglintegration.h
+++ b/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglintegration.h
@@ -86,7 +86,7 @@ private:
     static void wlDisplayHandleGlobal(void *data, struct wl_registry *registry, uint32_t id, const QString &interface, uint32_t version);
 
     struct wl_display *m_waylandDisplay = nullptr;
-    struct qt_brcm *m_waylandBrcm;
+    struct qt_brcm *m_waylandBrcm = nullptr;
 
     EGLDisplay m_eglDisplay;
 };
diff --git a/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.cpp b/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.cpp
index 6b3c614a5..5cd52f676 100644
--- a/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.cpp
+++ b/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.cpp
@@ -120,9 +120,9 @@ private:
     QSize m_size;
     bool m_released = true;
     wl_array m_array;
-    EGLint *m_data;
-    QWaylandDisplay *m_display;
-    struct wl_event_queue *m_eventQueue;
+    EGLint *m_data = nullptr;
+    QWaylandDisplay *m_display = nullptr;
+    struct wl_event_queue *m_eventQueue = nullptr;
 };
 
 QWaylandBrcmEglWindow::QWaylandBrcmEglWindow(QWindow *window)
diff --git a/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.h b/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.h
index 28376669d..2d418ecac 100644
--- a/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.h
+++ b/src/hardwareintegration/client/brcm-egl/qwaylandbrcmeglwindow.h
@@ -72,10 +72,10 @@ private:
     void createEglSurfaces();
     void destroyEglSurfaces();
 
-    QWaylandBrcmEglIntegration *m_eglIntegration;
-    struct wl_egl_window *m_waylandEglWindow;
+    QWaylandBrcmEglIntegration *m_eglIntegration = nullptr;
+    struct wl_egl_window *m_waylandEglWindow = nullptr;
 
-    const QWaylandWindow *m_parentWindow;
+    const QWaylandWindow *m_parentWindow = nullptr;
 
     EGLConfig m_eglConfig = 0;
 
@@ -85,7 +85,7 @@ private:
     QWaylandBrcmBuffer *m_buffers[3];
     QSurfaceFormat m_format;
 
-    struct wl_event_queue *m_eventQueue;
+    struct wl_event_queue *m_eventQueue = nullptr;
 
     int m_current = 0;
     int m_count = 0;
diff --git a/src/hardwareintegration/client/drm-egl-server/drmeglserverbufferintegration.h b/src/hardwareintegration/client/drm-egl-server/drmeglserverbufferintegration.h
index f1b722997..f9eb2d1d8 100644
--- a/src/hardwareintegration/client/drm-egl-server/drmeglserverbufferintegration.h
+++ b/src/hardwareintegration/client/drm-egl-server/drmeglserverbufferintegration.h
@@ -73,7 +73,7 @@ public:
     ~DrmServerBuffer();
     QOpenGLTexture* toOpenGlTexture() override;
 private:
-    DrmEglServerBufferIntegration *m_integration;
+    DrmEglServerBufferIntegration *m_integration = nullptr;
     EGLImageKHR m_image;
     QOpenGLTexture *m_texture = nullptr;
 };
diff --git a/src/hardwareintegration/client/libhybris-egl-server/libhybriseglserverbufferintegration.h b/src/hardwareintegration/client/libhybris-egl-server/libhybriseglserverbufferintegration.h
index 1ba38e6e4..0bfbe0ea4 100644
--- a/src/hardwareintegration/client/libhybris-egl-server/libhybriseglserverbufferintegration.h
+++ b/src/hardwareintegration/client/libhybris-egl-server/libhybriseglserverbufferintegration.h
@@ -81,7 +81,7 @@ protected:
     void libhybris_buffer_add_fd(int32_t fd) override;
 
 private:
-    LibHybrisEglServerBufferIntegration *m_integration;
+    LibHybrisEglServerBufferIntegration *m_integration = nullptr;
     EGLImageKHR m_image;
     QOpenGLTexture *m_texture = nullptr;
     int m_numFds;
diff --git a/src/hardwareintegration/client/shm-emulation-server/shmserverbufferintegration.h b/src/hardwareintegration/client/shm-emulation-server/shmserverbufferintegration.h
index 788344ff6..5c63092fe 100644
--- a/src/hardwareintegration/client/shm-emulation-server/shmserverbufferintegration.h
+++ b/src/hardwareintegration/client/shm-emulation-server/shmserverbufferintegration.h
@@ -61,7 +61,7 @@ public:
     ~ShmServerBuffer();
     QOpenGLTexture* toOpenGlTexture() override;
 private:
-    ShmServerBufferIntegration *m_integration;
+    ShmServerBufferIntegration *m_integration = nullptr;
     QOpenGLTexture *m_texture = nullptr;
     QString m_key;
     int m_bpl;
diff --git a/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.h b/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.h
index 94947365c..c5ba072a0 100644
--- a/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.h
+++ b/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.h
@@ -81,10 +81,10 @@ private Q_SLOTS:
     void doInvalidateSurface();
 
 private:
-    QWaylandEglClientBufferIntegration *m_clientBufferIntegration;
+    QWaylandEglClientBufferIntegration *m_clientBufferIntegration = nullptr;
     struct wl_egl_window *m_waylandEglWindow = nullptr;
 
-    const QWaylandWindow *m_parentWindow;
+    const QWaylandWindow *m_parentWindow = nullptr;
 
     EGLSurface m_eglSurface = EGL_NO_SURFACE;
     EGLConfig m_eglConfig;
diff --git a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
index 740ad6b10..740e9641c 100644
--- a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
+++ b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
@@ -219,8 +219,8 @@ public:
         m_blitProgram->disableAttributeArray(1);
     }
 
-    QOpenGLShaderProgram *m_blitProgram;
-    QWaylandGLContext *m_context;
+    QOpenGLShaderProgram *m_blitProgram = nullptr;
+    QWaylandGLContext *m_context = nullptr;
 };
 
 
@@ -512,7 +512,7 @@ private:
         GLint stride;
         GLenum type;
         bool normalized;
-        void *pointer;
+        void *pointer = nullptr;
     } m_vertexAttribs[STATE_GUARD_VERTEX_ATTRIB_COUNT];
     GLenum m_minFilter;
     GLenum m_magFilter;
diff --git a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.h b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.h
index af1c4e04d..9e876ac17 100644
--- a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.h
+++ b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.h
@@ -84,7 +84,7 @@ private:
     void updateGLFormat();
 
     EGLDisplay m_eglDisplay;
-    QWaylandDisplay *m_display;
+    QWaylandDisplay *m_display = nullptr;
     EGLContext m_context;
     EGLContext m_shareEGLContext;
     EGLConfig m_config;
diff --git a/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglclientbufferintegration.h b/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglclientbufferintegration.h
index 3742e1f56..2adaf0acf 100644
--- a/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglclientbufferintegration.h
+++ b/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglclientbufferintegration.h
@@ -93,7 +93,7 @@ public:
 
 private:
     QWaylandDisplay *mWaylandDisplay = nullptr;
-    struct qt_xcomposite *mWaylandComposite;
+    struct qt_xcomposite *mWaylandComposite = nullptr;
 
     Display *mDisplay = nullptr;
     EGLDisplay mEglDisplay;
diff --git a/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglwindow.h b/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglwindow.h
index d90159fa7..0c8bcf441 100644
--- a/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglwindow.h
+++ b/src/hardwareintegration/client/xcomposite-egl/qwaylandxcompositeeglwindow.h
@@ -65,7 +65,7 @@ public:
 private:
     void createEglSurface();
 
-    QWaylandXCompositeEGLClientBufferIntegration *m_glxIntegration;
+    QWaylandXCompositeEGLClientBufferIntegration *m_glxIntegration = nullptr;
     QWaylandBuffer *m_buffer = nullptr;
 
     Window m_xWindow = 0;
diff --git a/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxcontext.h b/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxcontext.h
index d95f57be7..1bb2f4f7d 100644
--- a/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxcontext.h
+++ b/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxcontext.h
@@ -69,7 +69,7 @@ public:
 private:
     GLXContext m_context;
 
-    Display *m_display;
+    Display *m_display = nullptr;
     QSurfaceFormat m_format;
 };
 
diff --git a/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxwindow.h b/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxwindow.h
index c2df592ee..45a77a299 100644
--- a/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxwindow.h
+++ b/src/hardwareintegration/client/xcomposite-glx/qwaylandxcompositeglxwindow.h
@@ -67,7 +67,7 @@ public:
 private:
     void createSurface();
 
-    QWaylandXCompositeGLXIntegration *m_glxIntegration;
+    QWaylandXCompositeGLXIntegration *m_glxIntegration = nullptr;
 
     Window m_xWindow = 0;
     GLXFBConfig m_config;
diff --git a/src/hardwareintegration/compositor/drm-egl-server/drmeglserverbufferintegration.h b/src/hardwareintegration/compositor/drm-egl-server/drmeglserverbufferintegration.h
index b3bcc3109..f6f162999 100644
--- a/src/hardwareintegration/compositor/drm-egl-server/drmeglserverbufferintegration.h
+++ b/src/hardwareintegration/compositor/drm-egl-server/drmeglserverbufferintegration.h
@@ -83,7 +83,7 @@ public:
     QOpenGLTexture *toOpenGlTexture() override;
 
 private:
-    DrmEglServerBufferIntegration *m_integration;
+    DrmEglServerBufferIntegration *m_integration = nullptr;
 
     EGLImageKHR m_image;
 
diff --git a/src/hardwareintegration/compositor/libhybris-egl-server/libhybriseglserverbufferintegration.h b/src/hardwareintegration/compositor/libhybris-egl-server/libhybriseglserverbufferintegration.h
index f99dacd99..f4b297785 100644
--- a/src/hardwareintegration/compositor/libhybris-egl-server/libhybriseglserverbufferintegration.h
+++ b/src/hardwareintegration/compositor/libhybris-egl-server/libhybriseglserverbufferintegration.h
@@ -84,7 +84,7 @@ public:
     QOpenGLTexture *toOpenGlTexture() override;
 
 private:
-    LibHybrisEglServerBufferIntegration *m_integration;
+    LibHybrisEglServerBufferIntegration *m_integration = nullptr;
 
     EGLImageKHR m_image;
     EGLClientBuffer m_buffer;
diff --git a/src/hardwareintegration/compositor/shm-emulation-server/shmserverbufferintegration.h b/src/hardwareintegration/compositor/shm-emulation-server/shmserverbufferintegration.h
index c303e5f18..850ad040a 100644
--- a/src/hardwareintegration/compositor/shm-emulation-server/shmserverbufferintegration.h
+++ b/src/hardwareintegration/compositor/shm-emulation-server/shmserverbufferintegration.h
@@ -67,9 +67,9 @@ public:
     QOpenGLTexture *toOpenGlTexture() override;
 
 private:
-    ShmServerBufferIntegration *m_integration;
+    ShmServerBufferIntegration *m_integration = nullptr;
 
-    QSharedMemory *m_shm;
+    QSharedMemory *m_shm = nullptr;
     int m_width;
     int m_height;
     int m_bpl;
diff --git a/src/hardwareintegration/compositor/wayland-egl/waylandeglclientbufferintegration.h b/src/hardwareintegration/compositor/wayland-egl/waylandeglclientbufferintegration.h
index 60ce814de..04b99ea34 100644
--- a/src/hardwareintegration/compositor/wayland-egl/waylandeglclientbufferintegration.h
+++ b/src/hardwareintegration/compositor/wayland-egl/waylandeglclientbufferintegration.h
@@ -85,8 +85,8 @@ private:
 
     WaylandEglClientBuffer(WaylandEglClientBufferIntegration* integration, wl_resource *bufferResource);
 
-    BufferState *d;
-    WaylandEglClientBufferIntegration *m_integration;
+    BufferState *d = nullptr;
+    WaylandEglClientBufferIntegration *m_integration = nullptr;
 };
 
 QT_END_NAMESPACE
diff --git a/src/hardwareintegration/compositor/xcomposite-egl/xcompositeeglintegration.h b/src/hardwareintegration/compositor/xcomposite-egl/xcompositeeglintegration.h
index f57f741c2..aa6c5b87a 100644
--- a/src/hardwareintegration/compositor/xcomposite-egl/xcompositeeglintegration.h
+++ b/src/hardwareintegration/compositor/xcomposite-egl/xcompositeeglintegration.h
@@ -79,7 +79,7 @@ public:
 
 private:
     QOpenGLTexture *m_texture = nullptr;
-    XCompositeEglClientBufferIntegration *m_integration;
+    XCompositeEglClientBufferIntegration *m_integration = nullptr;
 };
 
 QT_END_NAMESPACE
diff --git a/src/hardwareintegration/compositor/xcomposite-glx/xcompositeglxintegration.h b/src/hardwareintegration/compositor/xcomposite-glx/xcompositeglxintegration.h
index 23b856e93..948632ef1 100644
--- a/src/hardwareintegration/compositor/xcomposite-glx/xcompositeglxintegration.h
+++ b/src/hardwareintegration/compositor/xcomposite-glx/xcompositeglxintegration.h
@@ -87,7 +87,7 @@ public:
 
 private:
     QOpenGLTexture *m_texture = nullptr;
-    XCompositeGLXClientBufferIntegration *m_integration;
+    XCompositeGLXClientBufferIntegration *m_integration = nullptr;
     GLXPixmap m_glxPixmap = 0;
 };
 
diff --git a/src/hardwareintegration/compositor/xcomposite_share/xcompositehandler.h b/src/hardwareintegration/compositor/xcomposite_share/xcompositehandler.h
index b30d5cca3..bb43ed1af 100644
--- a/src/hardwareintegration/compositor/xcomposite_share/xcompositehandler.h
+++ b/src/hardwareintegration/compositor/xcomposite_share/xcompositehandler.h
@@ -55,7 +55,7 @@ public:
     XCompositeHandler(QWaylandCompositor *compositor, Display *display);
 
 private:
-    QWindow *mFakeRootWindow;
+    QWindow *mFakeRootWindow = nullptr;
 
     QString mDisplayString;
 
diff --git a/src/plugins/platforms/qwayland-xcomposite-glx/qwaylandxcompositeglxplatformintegration.h b/src/plugins/platforms/qwayland-xcomposite-glx/qwaylandxcompositeglxplatformintegration.h
index 32e286c52..3e6eeea4d 100644
--- a/src/plugins/platforms/qwayland-xcomposite-glx/qwaylandxcompositeglxplatformintegration.h
+++ b/src/plugins/platforms/qwayland-xcomposite-glx/qwaylandxcompositeglxplatformintegration.h
@@ -62,7 +62,7 @@ public:
     { return m_client_buffer_integration; }
 
 private:
-    QWaylandClientBufferIntegration *m_client_buffer_integration;
+    QWaylandClientBufferIntegration *m_client_buffer_integration = nullptr;
 };
 
 }
diff --git a/src/plugins/shellintegration/ivi-shell/qwaylandivisurface_p.h b/src/plugins/shellintegration/ivi-shell/qwaylandivisurface_p.h
index f24ecd37a..6cab1c98f 100644
--- a/src/plugins/shellintegration/ivi-shell/qwaylandivisurface_p.h
+++ b/src/plugins/shellintegration/ivi-shell/qwaylandivisurface_p.h
@@ -69,7 +69,7 @@ private:
     virtual void ivi_surface_configure(int32_t width, int32_t height) override;
     void ivi_controller_surface_visibility(int32_t visibility) override;
 
-    QWaylandWindow *m_window;
+    QWaylandWindow *m_window = nullptr;
     QWaylandExtendedSurface *m_extendedWindow = nullptr;
 };
 
diff --git a/src/shared/qwaylandsharedmemoryformathelper_p.h b/src/shared/qwaylandsharedmemoryformathelper_p.h
index 7f2f77cc3..e5b5faf02 100644
--- a/src/shared/qwaylandsharedmemoryformathelper_p.h
+++ b/src/shared/qwaylandsharedmemoryformathelper_p.h
@@ -63,7 +63,7 @@ private:
             , data(data)
         { }
         const size_t size;
-        const wl_shm_format *data;
+        const wl_shm_format *data = nullptr;
     };
 
     static const Array getData()
diff --git a/tests/auto/client/client/tst_client.cpp b/tests/auto/client/client/tst_client.cpp
index 8ee52d736..4eb85818c 100644
--- a/tests/auto/client/client/tst_client.cpp
+++ b/tests/auto/client/client/tst_client.cpp
@@ -170,7 +170,7 @@ private slots:
     void glWindow();
 
 private:
-    MockCompositor *compositor;
+    MockCompositor *compositor = nullptr;
 };
 
 void tst_WaylandClient::primaryScreen()
diff --git a/tests/auto/client/shared/mockcompositor.h b/tests/auto/client/shared/mockcompositor.h
index c6de12376..c0c3c884f 100644
--- a/tests/auto/client/shared/mockcompositor.h
+++ b/tests/auto/client/shared/mockcompositor.h
@@ -141,7 +141,7 @@ private:
     friend class Impl::Compositor;
     friend class Impl::Surface;
 
-    Impl::Surface *m_surface;
+    Impl::Surface *m_surface = nullptr;
 };
 
 Q_DECLARE_METATYPE(QSharedPointer<MockSurface>)
@@ -151,7 +151,7 @@ public:
     Impl::Output *handle() const { return m_output; }
     MockOutput(Impl::Output *output);
 private:
-    Impl::Output *m_output;
+    Impl::Output *m_output = nullptr;
 };
 
 Q_DECLARE_METATYPE(QSharedPointer<MockOutput>)
@@ -201,7 +201,7 @@ private:
         typedef void (*Callback)(void *target, const QList<QVariant> &parameters);
 
         Callback callback;
-        void *target;
+        void *target = nullptr;
         QList<QVariant> parameters;
     };
 
diff --git a/tests/auto/client/shared/mockinput.h b/tests/auto/client/shared/mockinput.h
index 5760ab40c..d9adb3621 100644
--- a/tests/auto/client/shared/mockinput.h
+++ b/tests/auto/client/shared/mockinput.h
@@ -60,7 +60,7 @@ protected:
     void seat_get_touch(Resource *resource, uint32_t id) override;
 
 private:
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
 
     QScopedPointer<Keyboard> m_keyboard;
     QScopedPointer<Pointer> m_pointer;
@@ -83,7 +83,7 @@ protected:
     void keyboard_destroy_resource(wl_keyboard::Resource *resource) override;
 
 private:
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
 
     Resource *m_focusResource = nullptr;
     Surface *m_focus = nullptr;
@@ -106,7 +106,7 @@ protected:
     void pointer_destroy_resource(wl_pointer::Resource *resource) override;
 
 private:
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
 
     Resource *m_focusResource = nullptr;
     Surface *m_focus = nullptr;
@@ -121,7 +121,7 @@ public:
     void sendMotion(Surface *surface, const QPoint &position, int id);
     void sendFrame(Surface *surface);
 private:
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
 };
 
 class DataOffer : public QtWaylandServer::wl_data_offer
@@ -145,7 +145,7 @@ protected:
     void data_device_start_drag(Resource *resource, struct ::wl_resource *source, struct ::wl_resource *origin, struct ::wl_resource *icon, uint32_t serial) override;
 
 private:
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
     QtWaylandServer::wl_data_offer *m_dataOffer = nullptr;
     Surface* m_focus = nullptr;
 };
@@ -162,7 +162,7 @@ protected:
     void data_device_manager_create_data_source(Resource *resource, uint32_t id) override;
 
 private:
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
 
     QScopedPointer<DataDevice> m_data_device;
 };
diff --git a/tests/auto/client/shared/mocksurface.h b/tests/auto/client/shared/mocksurface.h
index 8bf6eb755..68fe9b94c 100644
--- a/tests/auto/client/shared/mocksurface.h
+++ b/tests/auto/client/shared/mocksurface.h
@@ -65,7 +65,7 @@ protected:
 private:
     wl_resource *m_buffer = nullptr;
 
-    Compositor *m_compositor;
+    Compositor *m_compositor = nullptr;
     QSharedPointer<MockSurface> m_mockSurface;
     QList<wl_resource *> m_frameCallbackList;
     bool m_mapped = false;
diff --git a/tests/auto/client/xdgshellv6/tst_xdgshellv6.cpp b/tests/auto/client/xdgshellv6/tst_xdgshellv6.cpp
index 5aac336f2..9e4aa8c07 100644
--- a/tests/auto/client/xdgshellv6/tst_xdgshellv6.cpp
+++ b/tests/auto/client/xdgshellv6/tst_xdgshellv6.cpp
@@ -82,7 +82,7 @@ private slots:
     void createDestroyWindow();
 
 private:
-    MockCompositor *m_compositor;
+    MockCompositor *m_compositor = nullptr;
 };
 
 void tst_WaylandClientXdgShellV6::createDestroyWindow()
diff --git a/tests/auto/compositor/compositor/mockclient.h b/tests/auto/compositor/compositor/mockclient.h
index 8933f8327..820f2df39 100644
--- a/tests/auto/compositor/compositor/mockclient.h
+++ b/tests/auto/compositor/compositor/mockclient.h
@@ -45,7 +45,7 @@ public:
     ~ShmBuffer();
 
     struct wl_buffer *handle = nullptr;
-    struct wl_shm_pool *shm_pool;
+    struct wl_shm_pool *shm_pool = nullptr;
     QImage image;
 };
 
@@ -62,10 +62,10 @@ public:
     xdg_surface *createXdgSurface(wl_surface *surface);
     ivi_surface *createIviSurface(wl_surface *surface, uint iviId);
 
-    wl_display *display;
+    wl_display *display = nullptr;
     wl_compositor *compositor = nullptr;
     QMap<uint, wl_output *> m_outputs;
-    wl_shm *shm;
+    wl_shm *shm = nullptr;
     wl_registry *registry = nullptr;
     wl_shell *wlshell = nullptr;
     xdg_shell *xdgShell = nullptr;
diff --git a/tests/auto/compositor/compositor/mockseat.h b/tests/auto/compositor/compositor/mockseat.h
index e6d5e0b1c..2cdd1df55 100644
--- a/tests/auto/compositor/compositor/mockseat.h
+++ b/tests/auto/compositor/compositor/mockseat.h
@@ -42,8 +42,8 @@ public:
     ~MockSeat();
     MockPointer *pointer() const { return m_pointer.data(); }
 
-    wl_seat *m_seat;
-    wl_keyboard *m_keyboard;
+    wl_seat *m_seat = nullptr;
+    wl_keyboard *m_keyboard = nullptr;
 
 private:
     QScopedPointer<MockPointer> m_pointer;