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diracdec: Check for negative quants which would cause out of array reads. 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-29 05:04:25 +01:00
parent 0065080320
commit 5cd8afee99
1 changed files with 8 additions and 2 deletions
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10
libavcodec/diracdec.c
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@ -491,10 +491,16 @@ static inline void codeblock(DiracContext *s, SubBand *b,
}
if (s->codeblock_mode && !(s->old_delta_quant && blockcnt_one)) {
int quant = b->quant;
if (is_arith)
b->quant += dirac_get_arith_int(c, CTX_DELTA_Q_F, CTX_DELTA_Q_DATA);
quant += dirac_get_arith_int(c, CTX_DELTA_Q_F, CTX_DELTA_Q_DATA);
else
b->quant += dirac_get_se_golomb(gb);
quant += dirac_get_se_golomb(gb);
if (quant < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid quant\n");
return;
}
b->quant = quant;
}
b->quant = FFMIN(b->quant, MAX_QUANT);