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vc1dec.c: Don't use uninitialized values of dmv_[x, y] 

MVDATA may or may not be transmitted. If it is not, both
dmv_x and dmv_y is to be assumed zero.

This may not trigger wrong picture in all systems, but
it's a bug nevertheless. Fixes SA10116.vc1 on my 64-bit
Windows 7.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Mashiat Sarker Shakkhar 2012-01-26 15:53:24 -08:00 committed by Ronald S. Bultje
parent fc115c80b7
commit d51d6ae9c4
1 changed files with 1 additions and 0 deletions
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libavcodec/vc1dec.c
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@ -3954,6 +3954,7 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
vc1_mc_4mv_chroma4(v);
} else {
mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];
dmv_x = dmv_y = 0;
if (mvbp) {
get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
}