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vc1dec: Override invalid macroblock quantizer

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
This commit is contained in:
Michael Niedermayer 2012-07-28 18:07:45 +06:00 committed by Kostya Shishkov
parent 2bf369b60c
commit 45838561f2
1 changed files with 5 additions and 0 deletions
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5
libavcodec/vc1dec.c
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@ -1048,6 +1048,11 @@ static void vc1_mc_4mv_chroma4(VC1Context *v)
mquant = v->altpq; \
if ((edges&8) && s->mb_y == (s->mb_height - 1)) \
mquant = v->altpq; \
if (!mquant || mquant > 31) { \
av_log(v->s.avctx, AV_LOG_ERROR, \
"Overriding invalid mquant %d\n", mquant); \
mquant = 1; \
} \
}
/**