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avcodec/wmalosslessdec: Fix integer overflow with sliding in padding bits 

Fixes: signed integer overflow: -53716100 * 256 cannot be represented in type 'int'
Fixes: 20143/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5716604000403456

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 b8a0be9352)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-18 19:55:23 +01:00
parent 3653108a5c
commit 52b9e7f530
1 changed files with 1 additions and 1 deletions
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libavcodec/wmalosslessdec.c
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@ -995,7 +995,7 @@ static int decode_subframe(WmallDecodeCtx *s)
if (s->bits_per_sample == 16) {
*s->samples_16[c]++ = (int16_t) s->channel_residues[c][j] * (1 << padding_zeroes);
} else {
*s->samples_32[c]++ = s->channel_residues[c][j] * (256 << padding_zeroes);
*s->samples_32[c]++ = s->channel_residues[c][j] * (256U << padding_zeroes);
}
}
}