From 0b882b4009c9fbe24020c2fe83b21ee43d0784ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Reimar=20D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
Date: Sun, 24 Jan 2010 18:07:29 +0000
Subject: [PATCH] Fix crash in MLP decoder due to integer overflow. Probably
 only DoS, init_get_bits sets buffer to NULL, thus causing a NULL-dereference
 directly after.

Originally committed as revision 21426 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/mlpdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index 8060ebe197..bfde83c09f 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -959,7 +959,7 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size,
 
     length = (AV_RB16(buf) & 0xfff) * 2;
 
-    if (length > buf_size)
+    if (length < 4 || length > buf_size)
         return -1;
 
     init_get_bits(&gb, (buf + 4), (length - 4) * 8);