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avcodec/wmalosslessdec: Fix integer overflows in revert_inter_ch_decorr()

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Fixes: signed integer overflow: -717241856 + -1434459904 cannot be represented in type 'int'
Fixes: 21405/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5677143666458624

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 e9a4c4fe9918220be492a4a9d74c2293fd706be3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-04-26 21:19:13 +02:00
parent 02656f5570
commit 296d4bf22e
1 changed files with 2 additions and 2 deletions
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4
libavcodec/wmalosslessdec.c
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@ -793,8 +793,8 @@ static void revert_inter_ch_decorr(WmallDecodeCtx *s, int tile_size)
else if (s->is_channel_coded[0] || s->is_channel_coded[1]) {
int icoef;
for (icoef = 0; icoef < tile_size; icoef++) {
s->channel_residues[0][icoef] -= s->channel_residues[1][icoef] >> 1;
s->channel_residues[1][icoef] += s->channel_residues[0][icoef];
s->channel_residues[0][icoef] -= (unsigned)(s->channel_residues[1][icoef] >> 1);
s->channel_residues[1][icoef] += (unsigned) s->channel_residues[0][icoef];
}
}
}