avcodec/h264_mvpred: Fix multiple runtime error: left shift of negative value

Fixes: 710/clusterfuzz-testcase-5091051431788544 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
8 years ago · ab998f4c7f
parent d23727e042
commit ab998f4c7f
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/h264_mvpred.h
+++ b/libavcodec/h264_mvpred.h
@ -248,7 +248,7 @@ static av_always_inline void pred_8x16_motion(const H264Context *const h,
            if (IS_INTERLACED(type)) {          \
                refn >>= 1;                     \
                AV_COPY32(mvbuf[idx], mvn);     \
-                mvbuf[idx][1] <<= 1;            \
+                mvbuf[idx][1] *= 2;             \
                mvn = mvbuf[idx];               \
            }                                   \
        }                                       \