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avformat/mvdec: Use 64 bit in timestamp computation

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Fixes: division by zero
Fixes: 42198/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5054366405492736.fuzz
Fixes: 42222/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-4561249331970048

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-12-15 18:37:13 +01:00
parent 9092e58c44
commit 99b2700f5b
1 changed files with 1 additions and 1 deletions
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libavformat/mvdec.c
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@ -381,7 +381,7 @@ static int mv_read_header(AVFormatContext *avctx)
avio_skip(pb, 8);
av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
timestamp += asize / (ast->codecpar->channels * bytes_per_sample);
timestamp += asize / (ast->codecpar->channels * (uint64_t)bytes_per_sample);
}
} else if (!version && avio_rb16(pb) == 3) {
avio_skip(pb, 4);