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avcodec/alacdsp: fix integer overflow in decorrelate_stereo() 

Fixes: signed integer overflow: -16777216 * 131 cannot be represented in type 'int'
Fixes: 23835/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5669943160078336
Fixes: 41101/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-4636330705944576

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 2020-07-23 23:34:15 +02:00
parent b780b6db64
commit 68457c1e85
1 changed files with 1 additions and 1 deletions
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libavcodec/alacdsp.c
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@ -34,7 +34,7 @@ static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
a = buffer[0][i];
b = buffer[1][i];
a -= (b * decorr_left_weight) >> decorr_shift;
a -= (int)(b * (unsigned)decorr_left_weight) >> decorr_shift;
b += a;
buffer[0][i] = b;