[FFmpeg-cvslog] Check for corrupted data in avs demuxer.

[Laurent Aimar]

ffmpeg | branch: release/0.8 | Laurent Aimar <fenrir at videolan.org> | Sat Oct  1 00:44:54 2011 +0200| [c23d5261f79671a598f32be8bc403552891af24e] | committer: Michael Niedermayer

Check for corrupted data in avs demuxer.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 1cce7def0a8eff2e7db294b7d195a0fb1a5043b0)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c23d5261f79671a598f32be8bc403552891af24e
---

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

diff --git a/libavformat/avs.c b/libavformat/avs.c
index 355ae31..8302379 100644
--- a/libavformat/avs.c
+++ b/libavformat/avs.c
@@ -163,6 +163,8 @@ static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
             sub_type = avio_r8(s->pb);
             type = avio_r8(s->pb);
             size = avio_rl16(s->pb);
+            if (size < 4)
+                return AVERROR_INVALIDDATA;
             avs->remaining_frame_size -= size;
 
             switch (type) {