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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-02-17 12:21:18 -0800 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2012-02-18 09:12:32 -0800 |
| commit | 41afac7f7a67c634c86b1d17fc930e9183d4aaa0 (patch) | |
| tree | 73cd4eb5eecbdcb87fb1eff0ef92cea7ee333ce2 | |
| parent | 74699ac8c8b562e9f8d26e21482b89585365774a (diff) | |
| download | ffmpeg-41afac7f7a67c634c86b1d17fc930e9183d4aaa0.tar.gz | |
asf: prevent packet_size_left from going negative if hdrlen > pktlen.
This prevents failed assertions further down in the packet processing
where we require non-negative values for packet_size_left.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
| -rw-r--r-- | libavformat/asfdec.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c index bae0eacd10..2922ecf515 100644 --- a/libavformat/asfdec.c +++ b/libavformat/asfdec.c @@ -789,6 +789,13 @@ static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb) asf->packet_segments = 1; asf->packet_segsizetype = 0x80; } + if (rsize > packet_length - padsize) { + asf->packet_size_left = 0; + av_log(s, AV_LOG_ERROR, + "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n", + rsize, packet_length, padsize, avio_tell(pb)); + return -1; + } asf->packet_size_left = packet_length - padsize - rsize; if (packet_length < asf->hdr.min_pktsize) padsize += asf->hdr.min_pktsize - packet_length; |