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avcodec/takdsp: Fix negative shift in decorrelate_sf() 

Fixes: left shift of negative value -4
Fixes: 25723/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TAK_fuzzer-6250580752990208

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 2020-09-24 21:59:04 +02:00
parent 2ad9c95c26
commit 4f54f53003
1 changed files with 1 additions and 1 deletions
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libavcodec/takdsp.c
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@ -65,7 +65,7 @@ static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int
for (i = 0; i < length; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
b = (unsigned)(dfactor * (b >> dshift) + 128 >> 8) << dshift;
p1[i] = b - a;
}
}