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avformat/dcstr: Check sample rate

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Fixes: signed integer overflow: -1300248894420254720 * 16 cannot be represented in type 'long'
Fixes: 30879/clusterfuzz-testcase-minimized-ffmpeg_dem_DCSTR_fuzzer-5094464215449600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-03 10:49:03 +01:00
parent 6a3f345c1a
commit fdcb966f4a
1 changed files with 2 additions and 0 deletions
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2
libavformat/dcstr.c
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@ -43,6 +43,8 @@ static int dcstr_read_header(AVFormatContext *s)
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->channels = avio_rl32(s->pb); st->codecpar->channels = avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb); st->codecpar->sample_rate = avio_rl32(s->pb);
if (st->codecpar->sample_rate <= 0)
return AVERROR_INVALIDDATA;
codec = avio_rl32(s->pb); codec = avio_rl32(s->pb);
align = avio_rl32(s->pb); align = avio_rl32(s->pb);
avio_skip(s->pb, 4); avio_skip(s->pb, 4);