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avcodec/apedec: Fix 2 integer overflows in filter_3800()

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Fixes: signed integer overflow: 1683879955 - -466265224 cannot be represented in type 'int'
Fixes: 37419/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-6074294407921664

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 2021-09-04 19:55:28 +02:00
parent e58692837c
commit 33feb527ff
1 changed files with 2 additions and 2 deletions
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4
libavcodec/apedec.c
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@ -909,8 +909,8 @@ static av_always_inline int filter_3800(APEPredictor *p,
return predictionA;
}
d2 = p->buf[delayA];
d1 = (p->buf[delayA] - p->buf[delayA - 1]) * 2U;
d0 = p->buf[delayA] + ((p->buf[delayA - 2] - p->buf[delayA - 1]) * 8U);
d1 = (p->buf[delayA] - (unsigned)p->buf[delayA - 1]) * 2;
d0 = p->buf[delayA] + ((p->buf[delayA - 2] - (unsigned)p->buf[delayA - 1]) * 8);
d3 = p->buf[delayB] * 2U - p->buf[delayB - 1];
d4 = p->buf[delayB];