From 360130378b4a0029a2a341398b08a7d7acfe85d5 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Fri, 4 Feb 2005 18:58:59 +0000
Subject: [PATCH] fixing an integer overflow, which could lead to overwriting
 the end of a malloced buffer by 8 bytes

Originally committed as revision 3937 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/sierravmd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/sierravmd.c b/libavformat/sierravmd.c
index 16b6a8d4ccc..b1484b56057 100644
--- a/libavformat/sierravmd.c
+++ b/libavformat/sierravmd.c
@@ -212,7 +212,8 @@ static int vmd_read_header(AVFormatContext *s,
 
         /* if the frame size is 0, do not count the frame and bring the
          * total frame count down */
-        vmd->frame_table[i].frame_size = LE_32(&current_frame_record[2]);
+        // note, we limit the size to 1Gb to ensure that we dont end up overflowing the size integer used to allocate the memory
+        vmd->frame_table[i].frame_size = LE_32(&current_frame_record[2]) & 0x3FFFFFFF; 
 
         /* this logic is present so that 0-length audio chunks are not
          * accounted */
-- 
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