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avcodec/diracdec: fix undefined behavior with shifts

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Fixes part of Ticket3466
Found-by: Andrey_Karpov / PVS-Studio
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit b8598f6ce61ccda3f2ff0c730b009fb650e42986)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-04-16 02:06:37 +02:00
parent 424b00a300
commit 90c7dfb907
1 changed files with 2 additions and 2 deletions
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4
libavcodec/diracdec.c
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@ -1343,8 +1343,8 @@ static int mc_subpel(DiracContext *s, DiracBlock *block, const uint8_t *src[5],
motion_y >>= s->chroma_y_shift;
}
mx = motion_x & ~(-1 << s->mv_precision);
my = motion_y & ~(-1 << s->mv_precision);
mx = motion_x & ~(-1U << s->mv_precision);
my = motion_y & ~(-1U << s->mv_precision);
motion_x >>= s->mv_precision;
motion_y >>= s->mv_precision;
/* normalize subpel coordinates to epel */