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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-31 22:00:35 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-01-06 11:30:43 +0100 |
| commit | 79dffb7f2cada156022200ebde505d7f8a9f5866 (patch) | |
| tree | 566864cfe323dde63c0cb516e39a85f1fa07a1fc | |
| parent | fe51b4d5a0a41bb3c0b06134d8a13c2468841be3 (diff) | |
| download | ffmpeg-79dffb7f2cada156022200ebde505d7f8a9f5866.tar.gz | |
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>
(cherry picked from commit 7f7af9e294f8bc00756922ab088430ea5b9d7498)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c index 3581d87b57..242a54069c 100644 --- a/libavcodec/vc1.c +++ b/libavcodec/vc1.c @@ -938,7 +938,9 @@ 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) |