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| author | Zane van Iperen <zane@zanevaniperen.com> | 2020-11-03 23:41:53 +1000 |
|---|---|---|
| committer | Zane van Iperen <zane@zanevaniperen.com> | 2020-11-05 07:58:06 +1000 |
| commit | 769ab6b86421aab3936bcef3fe1813875c7a5eb0 (patch) | |
| tree | c08af8560475bacf0c0af49c4a0f1ed9a1981f95 | |
| parent | 63f5f01226ff0d335ce1c2005fb73eaa05742741 (diff) | |
| download | ffmpeg-769ab6b86421aab3936bcef3fe1813875c7a5eb0.tar.gz | |
avformat/argo_brp: remove block_align check for audio
Causes a divide-by-zero in the rare case where:
- the file has an audio stream,
- the first audio frame isn't within the first BRP_BASF_LOOKAHEAD frames,
- an audio frame is encountered later, and
- its chunk header (except num_blocks) contains all zeros
(matching the uninitialised structure in the context)
The decoder will discard any garbage data, so the check isn't really needed.
Fixes: division by 0
Fixes: 26667/clusterfuzz-testcase-minimized-ffmpeg_dem_ARGO_BRP_fuzzer-5645146928185344.fuzz
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
| -rw-r--r-- | libavformat/argo_brp.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/libavformat/argo_brp.c b/libavformat/argo_brp.c index 766d4fd261..6d6da851e9 100644 --- a/libavformat/argo_brp.c +++ b/libavformat/argo_brp.c @@ -392,9 +392,6 @@ static int argo_brp_read_packet(AVFormatContext *s, AVPacket *pkt) return AVERROR_INVALIDDATA; blk.size -= ASF_CHUNK_HEADER_SIZE; - - if (blk.size % st->codecpar->block_align != 0) - return AVERROR_INVALIDDATA; } if ((ret = av_get_packet(s->pb, pkt, blk.size)) < 0) |