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avcodec/wmalosslessdec: Fix integer overflow in mclms_predict() 

Fixes: signed integer overflow: 2147483636 + 2048 cannot be represented in type 'int'
Fixes: 22016/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5109395618004992

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 2020-05-23 22:02:56 +02:00
parent 071e293723
commit c42ed06695
1 changed files with 1 additions and 1 deletions
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2
libavcodec/wmalosslessdec.c
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@ -676,7 +676,7 @@ static void mclms_predict(WmallDecodeCtx *s, int icoef, int *pred)
for (i = 0; i < ich; i++)
pred[ich] += (uint32_t)s->channel_residues[i][icoef] *
s->mclms_coeffs_cur[i + num_channels * ich];
pred[ich] += (1 << s->mclms_scaling) >> 1;
pred[ich] += (1U << s->mclms_scaling) >> 1;
pred[ich] >>= s->mclms_scaling;
s->channel_residues[ich][icoef] += (unsigned)pred[ich];
}