Ensure we don't access the GL share widget when it's being destroyed.

Zero the pointer before destroying the widget, as QGLWidget's destructor
may indirectly trigger access to the share widget.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index b4a4565..bed08cf 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -187,9 +187,10 @@ public:
     }
 
     void cleanup() {
-        delete widget;
-        widget = 0;
+        QGLWidget *w = widget;
         cleanedUp = true;
+        widget = 0;
+        delete w;
     }
 
     static bool cleanedUp;