[FFmpeg-cvslog] avcodec/snowdec: Fix integer overflow with motion vector residual
Michael Niedermayer
git at videolan.org
Sat Aug 25 22:51:18 EEST 2018
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Aug 20 20:15:19 2018 +0200| [acba153a148782c08f9fd17f0c05b93468f3cbd0] | committer: Michael Niedermayer
avcodec/snowdec: Fix integer overflow with motion vector residual
Fixes: signed integer overflow: -19818 + -2147483648 cannot be represented in type 'int'
Fixes: 9545/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SNOW_fuzzer-4928769537081344
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=acba153a148782c08f9fd17f0c05b93468f3cbd0
---
libavcodec/snowdec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c
index 0146a2a4c9..59bd24e881 100644
--- a/libavcodec/snowdec.c
+++ b/libavcodec/snowdec.c
@@ -208,8 +208,8 @@ static int decode_q_branch(SnowContext *s, int level, int x, int y){
return AVERROR_INVALIDDATA;
}
pred_mv(s, &mx, &my, ref, left, top, tr);
- mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
- my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
+ mx+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
+ my+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
}
set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
}else{
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