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From 19d31c5b036a46365584d7d97e87f7fe16150623 Mon Sep 17 00:00:00 2001
From: Lars Knoll <lars.knoll@digia.com>
Date: Thu, 24 Apr 2014 15:33:27 +0200
Subject: [PATCH] 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.
Backport of Id82a4036f478bd6e49c402d6598f57e7e5bb5e1e from Qt 5
Task-number: QTBUG-38367
Change-Id: I0680740018aaa8356d267b7af3f01fac3697312a
Security-advisory: CVE-2014-0190
---
src/gui/image/qgifhandler.cpp | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/gui/image/qgifhandler.cpp b/src/gui/image/qgifhandler.cpp
index 3324f04..5199dd3 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;
--
1.8.5.1
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