From 23218a980170a7bad1e2359889fb1d8da73777e1 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Tue, 15 Sep 2009 15:22:36 +0000
Subject: [PATCH] Make probing for VC1 test bitstream format stricter

Originally committed as revision 19860 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/vc1test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/vc1test.c b/libavformat/vc1test.c
index 861846c48a..f7ac984c9b 100644
--- a/libavformat/vc1test.c
+++ b/libavformat/vc1test.c
@@ -33,7 +33,9 @@
 
 static int vc1t_probe(AVProbeData *p)
 {
-    if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4)
+    if (p->buf_size < 24)
+        return 0;
+    if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
         return 0;
 
     return AVPROBE_SCORE_MAX/2;