From 62da9203fd0c26e075c59eb6a82006de22fdbdc1 Mon Sep 17 00:00:00 2001
From: Laurent Aimar <fenrir@videolan.org>
Date: Sat, 1 Oct 2011 00:44:55 +0200
Subject: [PATCH] Check for out of bound writes in the avs demuxer.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 5d44c061cf511d97be5fac8d76be2f3915c6e798)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/avs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/avs.c b/libavformat/avs.c
index 878898edbc..eda7f9d2f7 100644
--- a/libavformat/avs.c
+++ b/libavformat/avs.c
@@ -169,6 +169,8 @@ static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
 
             switch (type) {
             case AVS_PALETTE:
+                if (size - 4 > sizeof(palette))
+                    return AVERROR_INVALIDDATA;
                 ret = get_buffer(s->pb, palette, size - 4);
                 if (ret < size - 4)
                     return AVERROR(EIO);