From fed795927182335ddf6c8e39268cfcea989ef7ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Tue, 20 Jul 2010 11:52:29 +0000
Subject: [PATCH] asfdec: Don't read the video stream header if there isn't
 enough data

Originally committed as revision 24352 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/asfdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 0da4b94ee7..840c1864a5 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -361,7 +361,8 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
                     st->codec->frame_size = 1;
                     break;
                 }
-            } else if (type == AVMEDIA_TYPE_VIDEO) {
+            } else if (type == AVMEDIA_TYPE_VIDEO &&
+                       gsize - (url_ftell(pb) - pos1 + 24) >= 53) {
                 get_le32(pb);
                 get_le32(pb);
                 get_byte(pb);