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vc1: Do not read from array if index is invalid.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Mashiat Sarker Shakkhar
2012-03-24 15:49:34 -07:00
committed by Ronald S. Bultje
parent 2ad405548b
commit 95b192de5d
4 changed files with 22 additions and 6 deletions
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2
libavcodec/vc1.c
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@@ -492,7 +492,7 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
int nr, dr;
nr = get_bits(gb, 8);
dr = get_bits(gb, 4);
if (nr && nr < 8 && dr && dr < 3) {
if (nr > 0 && nr < 8 && dr > 0 && dr < 3) {
v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];
v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;
}