[FFmpeg-devel] [PATCH 1/2] avcodec/h264_direct: Fix runtime error: left shift of negative value -14

[Michael Niedermayer]

Fixes: 682/clusterfuzz-testcase-4799120021651456

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_direct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264_direct.c b/libavcodec/h264_direct.c
index 107c905db1..cbb84665b3 100644
--- a/libavcodec/h264_direct.c
+++ b/libavcodec/h264_direct.c
@@ -614,7 +614,7 @@ single_col:
 
                 {
                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * b4_stride];
-                    int my_col            = (mv_col[1] << y_shift) / 2;
+                    int my_col            = (mv_col[1] * (1 << y_shift)) / 2;
                     int mx                = (scale * mv_col[0] + 128) >> 8;
                     int my                = (scale * my_col    + 128) >> 8;
                     fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8,
-- 
2.11.0