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vc1dec: check end_mb_y / start_mb_y validity 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-16 13:35:41 +02:00
parent c4ce870967
commit e985cfd18b
1 changed files with 4 additions and 0 deletions
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4
libavcodec/vc1dec.c
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@ -5606,6 +5606,10 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
s->end_mb_y = (i == n_slices ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
else
s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
if (s->end_mb_y <= s->start_mb_y) {
av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y);
continue;
}
vc1_decode_blocks(v);
if (i != n_slices)
s->gb = slices[i].gb;