commit a1cf194c54be57d6ab55dfd26b9562a60532208e
Author: Eirik Aavitsland <eirik.aavitsland@theqtcompany.com>
Date:   Wed Mar 11 09:00:41 2015 +0100

    Fixes crash in gif image decoder
    
    Fuzzing test revealed that for certain malformed gif files,
    qgifhandler would segfault.
    
    Change-Id: I5bb6f60e1c61849e0d8c735edc3869945e5331c1
    (cherry picked from qtbase/ea2c5417fcd374302f5019e67f72af5facbd29f6)
    Reviewed-by: Richard J. Moore <rich@kde.org>

--- src/gui/image/qgifhandler.cpp
+++ src/gui/image/qgifhandler.cpp
@@ -944,6 +944,8 @@ void QGIFFormat::fillRect(QImage *image, int col, int row, int w, int h, QRgb co
 
 void QGIFFormat::nextY(unsigned char *bits, int bpl)
 {
+    if (out_of_bounds)
+        return;
     int my;
     switch (interlace) {
     case 0: // Non-interlaced
