Merge remote-tracking branch 'origin/stable' into dev

Conflicts:
	mkspecs/qnx-x86-qcc/qplatformdefs.h
	src/corelib/global/qglobal.h
	src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
	src/opengl/qgl.cpp
	src/opengl/qglpixelbuffer.cpp
	src/opengl/qglshaderprogram.cpp
	tests/auto/opengl/qglthreads/tst_qglthreads.cpp

Change-Id: Iaba137884d3526a139000ca26fee02bb27b5cdb5

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gui/image/qgifhandler.cpp b/src/gui/image/qgifhandler.cpp
index eeb62af4e5..19b838240f 100644
--- a/src/gui/image/qgifhandler.cpp
+++ b/src/gui/image/qgifhandler.cpp
@@ -359,6 +359,13 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
                     memset(bits, 0, image->byteCount());
                 }
 
+                // Check if the previous attempt to create the image failed. If it
+                // did then the image is broken and we should give up.
+                if (image->isNull()) {
+                    state = Error;
+                    return -1;
+                }
+
                 disposePrevious(image);
                 disposed = false;