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avcodec/tta: fix signed overflow in decorrelate 

Fixes: signed integer overflow: 2079654542 - -139267653 cannot be represented in type 'int'
Fixes: 60811/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TTA_fuzzer-5915858409750528

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 2023-08-05 14:35:55 +02:00
parent 182aef0198
commit 283bf5c35b
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1 changed files with 1 additions and 1 deletions
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libavcodec/tta.c
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@ -342,7 +342,7 @@ static int tta_decode_frame(AVCodecContext *avctx, AVFrame *frame,
if (s->channels > 1) {
int32_t *r = p - 1;
for (*p += *r / 2; r > (int32_t*)p - s->channels; r--)
*r = *(r + 1) - *r;
*r = *(r + 1) - (unsigned)*r;
}
cur_chan = 0;
i++;