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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-08-20 20:15:19 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-10-07 21:34:00 +0200 |
| commit | a04ff0c054e8036c8a9d1421a46bf936a66e3bc0 (patch) | |
| tree | 315c2353ab0a5fc7d82feee6b2b5e18891deb858 | |
| parent | ce828a247d5f6ae6cbb416dcdc56321be820ba4d (diff) | |
| download | ffmpeg-a04ff0c054e8036c8a9d1421a46bf936a66e3bc0.tar.gz | |
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@niedermayer.cc>
(cherry picked from commit acba153a148782c08f9fd17f0c05b93468f3cbd0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/snowdec.c | 4 |
1 files 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{ |