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Code Issues Releases Activity

avcodec/vc1_pred: Fix undefined shift in ff_vc1_pred_mv()

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Found-by: Clang -fsanitize=shift
Reported-by: Thierry Foucu <tfoucu@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-11 13:16:47 +01:00
parent 1932f7e2ee
commit e5dfa43619
1 changed files with 4 additions and 2 deletions
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6
libavcodec/vc1_pred.c
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@ -231,8 +231,10 @@ void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
else
mixedmv_pic = 0;
/* scale MV difference to be quad-pel */
dmv_x <<= 1 - s->quarter_sample;
dmv_y <<= 1 - s->quarter_sample;
if (!s->quarter_sample) {
dmv_x *= 2;
dmv_y *= 2;
}
wrap = s->b8_stride;
xy = s->block_index[n];