mirror of https://git.ffmpeg.org/ffmpeg.git
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>
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@ -178,7 +178,7 @@ static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,
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brfd = FFMIN(v->brfd, 3);
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scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];
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n = (n * scalesame >> 8) << hpel;
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n = (n * scalesame >> 8) * (1 << hpel);
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return n;
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}
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