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avcodec/vorbisdec: Check parameters in vorbis_floor0_decode() before divide

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Fixes: division by zero
Fixes: 16183/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VORBIS_fuzzer-5688966782648320

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 2019-08-04 12:28:55 +02:00
parent 652ea23cb3
commit aecc9b96d6
1 changed files with 3 additions and 0 deletions
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libavcodec/vorbisdec.c
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@ -1182,6 +1182,9 @@ static int vorbis_floor0_decode(vorbis_context *vc,
q *= q;
}
if (p + q == 0.0)
return AVERROR_INVALIDDATA;
/* calculate linear floor value */
q = exp((((amplitude*vf->amplitude_offset) /
(((1ULL << vf->amplitude_bits) - 1) * sqrt(p + q)))