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avcodec/apedec: Fix integer overflow in filter_3800()

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Fixes: signed integer overflow: -2147448926 + -198321 cannot be represented in type 'int'
Fixes: 48798/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5739619273015296
Fixes: 48798/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-6744428485672960

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 f05247f6a4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-09-11 00:30:42 +02:00
parent d4cb28f0cf
commit 4274c24665
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1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -880,7 +880,7 @@ static av_always_inline int filter_3800(APEPredictor *p,
p->coeffsB[filter][0] += (((d3 >> 29) & 4) - 2) * sign;
p->coeffsB[filter][1] -= (((d4 >> 30) & 2) - 1) * sign;
p->filterB[filter] = p->lastA[filter] + (predictionB >> shift);
p->filterB[filter] = p->lastA[filter] + (unsigned)(predictionB >> shift);
p->filterA[filter] = p->filterB[filter] + (unsigned)((int)(p->filterA[filter] * 31U) >> 5);
return p->filterA[filter];