[FFmpeg-cvslog] avcodec/tta: fix signed overflow in decorrelate
Michael Niedermayer
git at videolan.org
Mon Sep 4 22:46:16 EEST 2023
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Aug 5 14:35:55 2023 +0200| [283bf5c35bc5ac92e061f27c3a680318175a1600] | committer: Michael Niedermayer
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 at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=283bf5c35bc5ac92e061f27c3a680318175a1600
---
libavcodec/tta.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index f5e39df98d..7763ed7ffc 100644
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -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++;
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