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snow: reject unsupported chroma shifts.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-10 00:08:32 +01:00
parent aefd1cb725
commit 1af9fdc3ba
1 changed files with 5 additions and 0 deletions
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5
libavcodec/snowdec.c
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@ -336,6 +336,11 @@ 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);