[FFmpeg-devel] [PATCH 3/3] avcodec/h264_mvpred: Fix multiple runtime error: left shift of negative value

[Michael Niedermayer]

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 at niedermayer.cc>
---
 libavcodec/h264_mvpred.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264_mvpred.h b/libavcodec/h264_mvpred.h
index 24f250d794..339cf623d5 100644
--- 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];               \
             }                                   \
         }                                       \
-- 
2.11.0