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

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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@niedermayer.cc>
(cherry picked from commit a6eb006ad4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2017-05-15 21:21:20 +02:00
parent a1778b8cdd
commit c90ad2b5cc
1 changed files with 2 additions and 2 deletions
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4
libavcodec/svq3.c
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@@ -397,8 +397,8 @@ static inline int svq3_mc_dir(SVQ3Context *s, int size, int mode,
if (mode != PREDICT_MODE) {
pred_motion(h, sl, 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 * h->frame_num_offset /