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avcodec/vc1: check REFDIST 

"9.1.1.43 P Reference Distance (REFDIST)"
"The value of REFDIST shall be less than, or equal to, 16."

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-31 22:00:35 +02:00
parent cf41da2ad2
commit 7f7af9e294
1 changed files with 3 additions and 1 deletions
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4
libavcodec/vc1.c
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@ -933,7 +933,9 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
else if ((v->s.pict_type != AV_PICTURE_TYPE_B) && (v->s.pict_type != AV_PICTURE_TYPE_BI)) {
v->refdist = get_bits(gb, 2);
if (v->refdist == 3)
v->refdist += get_unary(gb, 0, 16);
v->refdist += get_unary(gb, 0, 14);
if (v->refdist > 16)
return AVERROR_INVALIDDATA;
}
if ((v->s.pict_type == AV_PICTURE_TYPE_B) || (v->s.pict_type == AV_PICTURE_TYPE_BI)) {
if (read_bfraction(v, gb) < 0)