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avcodec/alacdsp: Make intermediates unsigned

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Fixes: signed integer overflow: -14914387 + -2147418648 cannot be represented in type 'int'
Fixes: 46464/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-474307197311385

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 8709f4c10a216cb3e11564bc392841e832f8e3b1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-04-28 23:34:53 +02:00
parent c97bc2ae05
commit 080579e126
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1 changed files with 2 additions and 2 deletions
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libavcodec/alacdsp.c
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@ -29,12 +29,12 @@ static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
int i; int i;
for (i = 0; i < nb_samples; i++) { for (i = 0; i < nb_samples; i++) {
int32_t a, b; uint32_t a, b;
a = buffer[0][i]; a = buffer[0][i];
b = buffer[1][i]; b = buffer[1][i];
a -= (int)(b * (unsigned)decorr_left_weight) >> decorr_shift; a -= (int)(b * decorr_left_weight) >> decorr_shift;
b += a; b += a;
buffer[0][i] = b; buffer[0][i] = b;