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avcodec/apedec: Fix integer overflow in predictor_update_3930()

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Fixes: signed integer overflow: -69555262 * 31 cannot be represented in type 'int'
Fixes: 17698/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5728970447781888

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 2019-09-27 17:19:36 +02:00
parent 0c61661a2c
commit 5c072c9ed7
1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -1055,7 +1055,7 @@ static av_always_inline int predictor_update_3930(APEPredictor *p,
d3 * p->coeffsA[filter][3];
p->lastA[filter] = decoded + (predictionA >> 9);
p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
p->filterA[filter] = p->lastA[filter] + ((int)(p->filterA[filter] * 31U) >> 5);
sign = APESIGN(decoded);
p->coeffsA[filter][0] += ((d0 < 0) * 2 - 1) * sign;