[FFmpeg-cvslog] avcodec/svq3: Fix runtime error: left shift of negative value -6

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon May 15 21:21:20 2017 +0200| [b147ded288ead7b4f22de4add3b8912ae54b406f] | committer: Michael Niedermayer

avcodec/svq3: Fix runtime error: left shift of negative value -6

Fixes: 1604/clusterfuzz-testcase-minimized-5312060206350336

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit a6eb006ad47beb6d5e5cc2c99f8185965209ec6b)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b147ded288ead7b4f22de4add3b8912ae54b406f
---

 libavcodec/svq3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c
index 4814b80c3a..a766fa49ad 100644
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@@ -524,8 +524,8 @@ static inline int svq3_mc_dir(SVQ3Context *s, int size, int mode,
             if (mode != PREDICT_MODE) {
                 svq3_pred_motion(s, k, part_width >> 2, dir, 1, &mx, &my);
             } else {
-                mx = s->next_pic->motion_val[0][b_xy][0] << 1;
-                my = s->next_pic->motion_val[0][b_xy][1] << 1;
+                mx = s->next_pic->motion_val[0][b_xy][0] * 2;
+                my = s->next_pic->motion_val[0][b_xy][1] * 2;
 
                 if (dir == 0) {
                     mx = mx * s->frame_num_offset /