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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-10 18:57:25 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-06 20:30:57 +0100 |
| commit | 446238d170ca7d43d44aba479a782c6873a73627 (patch) | |
| tree | c7ea82c59a3f3cb888d52b071c832ec9fa3fa36c | |
| parent | e5796aa1b97a9255da9b38f3d3b8610e1bf160de (diff) | |
| download | ffmpeg-446238d170ca7d43d44aba479a782c6873a73627.tar.gz | |
avcodec/vc1_pred: Fix invalid shifts in scaleforopp()
Fixes: left shift of negative value -2
Fixes: 16964/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5757853565976576
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 ced9a1cd0ab76a65e509b0d7c56965d61ea1df84)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1_pred.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/vc1_pred.c b/libavcodec/vc1_pred.c index 8763707ef8..8b4a3054a3 100644 --- a/libavcodec/vc1_pred.c +++ b/libavcodec/vc1_pred.c @@ -191,9 +191,9 @@ static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */, n >>= hpel; if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) { if (dim) - n = scaleforopp_y(v, n, dir) << hpel; + n = scaleforopp_y(v, n, dir) * (1 << hpel); else - n = scaleforopp_x(v, n) << hpel; + n = scaleforopp_x(v, n) * (1 << hpel); return n; } if (v->s.pict_type != AV_PICTURE_TYPE_B) |