From eb1325047f2697d24e93ebaf924900affc876bc1 Mon Sep 17 00:00:00 2001 From: Lars Knoll Date: Thu, 24 Apr 2014 15:33:27 +0200 Subject: Don't crash on broken GIF images Broken GIF images could set invalid width and height values inside the image, leading to Qt creating a null QImage for it. In that case we need to abort decoding the image and return an error. Initial patch by Rich Moore. Task-number: QTBUG-38367 Change-Id: Id82a4036f478bd6e49c402d6598f57e7e5bb5e1e Security-advisory: CVE-2014-0190 Reviewed-by: Richard J. Moore --- src/gui/image/qgifhandler.cpp | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'src') 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; -- cgit v1.2.3