Fix xcb's native resource getters.

Returning pointers to unexpected types for unknown keys is quite
wrong. The clients expect 0 in such a case but what they got (until
now) was whatever was associated with the default constructed enum
value.

Change-Id: Iefd7bf461bfb2c1f4c73f5f9f291aecad60219eb
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>
Reviewed-by: Jani Uusi-Rantala <jani.uusi-rantala@nokia.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
index b7403cfdce..406f9c24bd 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
@@ -84,6 +84,9 @@ QXcbNativeInterface::QXcbNativeInterface()
 void *QXcbNativeInterface::nativeResourceForContext(const QByteArray &resourceString, QOpenGLContext *context)
 {
     QByteArray lowerCaseResource = resourceString.toLower();
+    if (!qXcbResourceMap()->contains(lowerCaseResource))
+        return 0;
+
     ResourceType resource = qXcbResourceMap()->value(lowerCaseResource);
     void *result = 0;
     switch(resource) {
@@ -91,14 +94,18 @@ void *QXcbNativeInterface::nativeResourceForContext(const QByteArray &resourceSt
         result = eglContextForContext(context);
         break;
     default:
-        result = 0;
+        break;
     }
+
     return result;
 }
 
 void *QXcbNativeInterface::nativeResourceForWindow(const QByteArray &resourceString, QWindow *window)
 {
     QByteArray lowerCaseResource = resourceString.toLower();
+    if (!qXcbResourceMap()->contains(lowerCaseResource))
+        return 0;
+
     ResourceType resource = qXcbResourceMap()->value(lowerCaseResource);
     void *result = 0;
     switch(resource) {
@@ -118,8 +125,9 @@ void *QXcbNativeInterface::nativeResourceForWindow(const QByteArray &resourceStr
         result = graphicsDeviceForWindow(window);
         break;
     default:
-        result = 0;
+        break;
     }
+
     return result;
 }