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h261: check mtype. 

Fixes out of array read

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-02 15:58:14 +01:00
parent 0b90db01b5
commit ec3cd74f2d
1 changed files with 4 additions and 0 deletions
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4
libavcodec/h261dec.c
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@ -286,6 +286,10 @@ static int h261_decode_mb(H261Context *h){
// Read mtype
h->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
if (h->mtype < 0) {
av_log(s->avctx, AV_LOG_ERROR, "illegal mtype %d\n", h->mtype);
return SLICE_ERROR;
}
h->mtype = h261_mtype_map[h->mtype];
// Read mquant