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vc1: check that slices have a positive height

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Fixes possible invalid reads.

CC: libav-stable@libav.org
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
This commit is contained in:
Anton Khirnov 2016-08-14 10:18:39 +02:00
parent 09b23786b3
commit 33f10546ec
1 changed files with 6 additions and 0 deletions
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6
libavcodec/vc1dec.c
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@ -881,6 +881,12 @@ 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, "Invalid slice size\n");
goto err;
}
ff_vc1_decode_blocks(v);
if (i != n_slices)
s->gb = slices[i].gb;