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avformat/genh: Check block_align

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Fixes: infinite loop
Fixes: 26440/clusterfuzz-testcase-minimized-ffmpeg_dem_GENH_fuzzer-5632134020333568

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-19 17:05:01 +02:00
parent a413ed9863
commit 37396e9ba8
1 changed files with 3 additions and 0 deletions
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3
libavformat/genh.c
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@ -146,6 +146,9 @@ static int genh_read_header(AVFormatContext *s)
}
}
if (st->codecpar->block_align <= 0)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, start_offset - avio_tell(s->pb));
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);