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snow: reject unsupported chroma shifts. 

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:
Michael Niedermayer 2012-03-10 00:08:32 +01:00 committed by Ronald S. Bultje
parent 92a02d935b
commit c9837954e7
1 changed files with 5 additions and 0 deletions
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5
libavcodec/snowdec.c
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@ -327,6 +327,11 @@ static int decode_header(SnowContext *s){
return -1;
}
if (s->chroma_h_shift != 1 || s->chroma_v_shift != 1) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid chroma shift\n");
return AVERROR_PATCHWELCOME;
}
s->qlog += get_symbol(&s->c, s->header_state, 1);
s->mv_scale += get_symbol(&s->c, s->header_state, 1);
s->qbias += get_symbol(&s->c, s->header_state, 1);