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

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>
(cherry picked from commit aecc9b96d6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
tags/n4.1.5
Michael Niedermayer 6 years ago
parent
commit
c05d5ca80b
1 changed files with 3 additions and 0 deletions
  1. +3
    -0
      libavcodec/vorbisdec.c

+ 3
- 0
libavcodec/vorbisdec.c View File

@@ -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)))


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