[FFmpeg-cvslog] avcodec/shorten: Fix a negative left shift in shorten_decode_frame()
Michael Niedermayer
git at videolan.org
Sat Jun 16 01:32:19 EEST 2018
ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Tue Jun 5 13:12:54 2018 +0200| [9a53e8572acc54c8f4bb8ca09f312075f88737f9] | committer: Michael Niedermayer
avcodec/shorten: Fix a negative left shift in shorten_decode_frame()
Fixes: left shift of negative value -9057
Fixes: 8527/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5666853924896768
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit a711efe922b2bf1d363bdf7f8357656c3e35021e)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9a53e8572acc54c8f4bb8ca09f312075f88737f9
---
libavcodec/shorten.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 8aeacfeb31..f7475b4954 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -710,7 +710,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
if (s->version < 2)
s->offset[channel][s->nmean - 1] = sum / s->blocksize;
else
- s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) << s->bitshift;
+ s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) * (1 << s->bitshift);
}
/* copy wrap samples for use with next block */
More information about the ffmpeg-cvslog
mailing list