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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-07-10 23:27:19 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-01-06 11:30:42 +0100 |
| commit | 46a1b4e8acccae5bbfb5aaac8ffdaf2ddf64d98e (patch) | |
| tree | f8e13c25dcc4a983375fdc27b67c337e256b160d | |
| parent | 38de5403c8536151b6c8a90d4dabfeba7b43d148 (diff) | |
| download | ffmpeg-46a1b4e8acccae5bbfb5aaac8ffdaf2ddf64d98e.tar.gz | |
avcodec/vc1_pred: Fix invalid shift in scaleforsame()
Fixes: left shift of negative value -1
Fixes: 15531/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5759556258365440
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 6dfda35dd29d2e2a86554d2c05d957a09ab79b0c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1_pred.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/vc1_pred.c b/libavcodec/vc1_pred.c index de736ec775..ea9ccedac9 100644 --- a/libavcodec/vc1_pred.c +++ b/libavcodec/vc1_pred.c @@ -178,7 +178,7 @@ static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */, brfd = FFMIN(v->brfd, 3); scalesame = ff_vc1_b_field_mvpred_scales[0][brfd]; - n = (n * scalesame >> 8) << hpel; + n = (n * scalesame >> 8) * (1 << hpel); return n; } |