QQuickWindowIncubationController: Use QPointer to guard QSGRenderLoop reference

In some cases, when the QGuiApplication is shutting down while there
is an active QAnimationDriver and an incubating object, the
QQuickWindowIncubationController will try to access an already
destroyed QSGRenderLoop. So use a QPointer to guard the QSGRenderLoop
access.

Fixes: QTBUG-90489
Pick-to: 5.15
Pick-to: 6.0
Change-Id: I528e06ff22dfcad804593db6771d9163b21808f4
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
index ccacc5d5a6..5e4fa0c43f 100644
--- a/src/quick/items/qquickwindow.cpp
+++ b/src/quick/items/qquickwindow.cpp
@@ -171,7 +171,7 @@ protected:
 
 public slots:
     void incubate() {
-        if (incubatingObjectCount()) {
+        if (m_renderLoop && incubatingObjectCount()) {
             if (m_renderLoop->interleaveIncubation()) {
                 incubateFor(m_incubation_time);
             } else {
@@ -187,12 +187,12 @@ public slots:
 protected:
     void incubatingObjectCountChanged(int count) override
     {
-        if (count && !m_renderLoop->interleaveIncubation())
+        if (count && m_renderLoop && !m_renderLoop->interleaveIncubation())
             incubateAgain();
     }
 
 private:
-    QSGRenderLoop *m_renderLoop;
+    QPointer<QSGRenderLoop> m_renderLoop;
     int m_incubation_time;
     int m_timer;
 };