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avcodec/ffwavesynth: Fix integer overflow for some corner case values 

Fixes: left shift of negative value -14671840
Fixes: 16000/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5145977817661440

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 2019-08-10 23:09:44 +02:00
parent 5974463767
commit c4a88fb546
1 changed files with 2 additions and 2 deletions
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4
libavcodec/ffwavesynth.c
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@ -301,8 +301,8 @@ static int wavesynth_parse_extradata(AVCodecContext *avc)
default:
return AVERROR(EINVAL);
}
in->amp0 = (int64_t)a1 << 32;
in->damp = (((int64_t)a2 << 32) - ((int64_t)a1 << 32)) / dt;
in->amp0 = (uint64_t)a1 << 32;
in->damp = (int64_t)(((uint64_t)a2 << 32) - ((uint64_t)a1 << 32)) / dt;
}
if (edata != edata_end)
return AVERROR(EINVAL);