From 04b0a37f879e13f8a5584afca2662a6c1d9e3c7c Mon Sep 17 00:00:00 2001
From: Alejandro Gonzalez <agonzalez@dextratech.com>
Date: Sat, 27 Nov 2010 16:07:19 -0600
Subject: [PATCH] qtmux: gst_qtmux_check_difference verify before subtract

Avoid negative overflow by checking the order of operands
on subtraction of unsigned integers.

https://bugzilla.gnome.org/show_bug.cgi?id=635878
---
 gst/quicktime/gstqtmux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gst/quicktime/gstqtmux.c b/gst/quicktime/gstqtmux.c
index e138869236..f2ad7754c9 100644
--- a/gst/quicktime/gstqtmux.c
+++ b/gst/quicktime/gstqtmux.c
@@ -1904,7 +1904,7 @@ static gboolean inline
 gst_qtmux_check_difference (GstQTMux * qtmux, GstClockTime a,
     GstClockTime b, GstClockTime magn)
 {
-  return ((a - b >= (magn >> 1)) || (b - a >= (magn >> 1)));
+  return ((a >= b) ? (a - b >= (magn >> 1)) : (b - a >= (magn >> 1)));
 }
 
 /*