[FFmpeg-cvslog] avsdemux: check for out of bound writes

[Laurent Aimar]

ffmpeg | branch: release/0.8 | Laurent Aimar <fenrir at videolan.org> | Fri Sep 30 23:42:31 2011 +0000| [7fa13e12e6eb0c791578e53a32dd6de0de0f8743] | committer: Reinhard Tartler

avsdemux: check for out of bound writes

Signed-off-by: Janne Grunau <janne-libav at jannau.net>
(cherry picked from commit 6de33611c918e6ad5bbc878840a59607cb42b8c0)

Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7fa13e12e6eb0c791578e53a32dd6de0de0f8743
---

 libavformat/avs.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavformat/avs.c b/libavformat/avs.c
index 52294b0..084d461 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 = avio_read(s->pb, palette, size - 4);
                 if (ret < size - 4)
                     return AVERROR(EIO);