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vp3dec: Check coefficient index in vp3_dequant()

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Fixes NGS00145

Found-by: Phillip Langlois
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-18 18:08:31 +01:00
parent 895d258e9b
commit eef5c35b43
1 changed files with 4 additions and 0 deletions
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4
libavcodec/vp3.c
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@ -1309,6 +1309,10 @@ static inline int vp3_dequant(Vp3DecodeContext *s, Vp3Fragment *frag,
case 1: // zero run case 1: // zero run
s->dct_tokens[plane][i]++; s->dct_tokens[plane][i]++;
i += (token >> 2) & 0x7f; i += (token >> 2) & 0x7f;
if(i>63){
av_log(s->avctx, AV_LOG_ERROR, "Coefficient index overflow\n");
return -1;
}
block[perm[i]] = (token >> 9) * dequantizer[perm[i]]; block[perm[i]] = (token >> 9) * dequantizer[perm[i]];
i++; i++;
break; break;