[FFmpeg-cvslog] avcodec/h264_direct: Fix runtime error: left shift of negative value -14

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Feb 28 03:13:24 2017 +0100| [4bd3f1ce3e68a9348e97ec07a247048ea72ed808] | committer: Michael Niedermayer

avcodec/h264_direct: Fix runtime error: left shift of negative value -14

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>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4bd3f1ce3e68a9348e97ec07a247048ea72ed808
---

 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 107c905..cbb8466 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,