[FFmpeg-cvslog] avcodec/shorten: Fix integer overflow with offset
Michael Niedermayer
git at videolan.org
Tue Nov 20 18:40:27 EET 2018
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Fri Nov 9 19:59:27 2018 +0100| [0728911951100305e8b2379ac37c44f5ac0c1c75] | committer: Michael Niedermayer
avcodec/shorten: Fix integer overflow with offset
Fixes: signed integer overflow: -1625810908 - 582229060 cannot be represented in type 'int'
Fixes: 10977/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5732602018267136
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 2f888771cd1ce8d68d4b18a1009650c1f260aaf2)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0728911951100305e8b2379ac37c44f5ac0c1c75
---
libavcodec/shorten.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 6ec1632aac..33a99158f9 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -306,7 +306,7 @@ static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
/* subtract offset from previous samples to use in prediction */
if (command == FN_QLPC && coffset)
for (i = -pred_order; i < 0; i++)
- s->decoded[channel][i] -= coffset;
+ s->decoded[channel][i] -= (unsigned)coffset;
/* decode residual and do LPC prediction */
init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset;
@@ -321,7 +321,7 @@ static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
/* add offset to current samples */
if (command == FN_QLPC && coffset)
for (i = 0; i < s->blocksize; i++)
- s->decoded[channel][i] += coffset;
+ s->decoded[channel][i] += (unsigned)coffset;
return 0;
}
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