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Don't read out-of-bounds values.
Originally committed as revision 5650 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -2511,7 +2511,8 @@ static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])
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int intrapred = 0;
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for(i=0; i<6; i++)
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if(is_intra[i]) {
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if(v->mb_type[0][s->block_index[i] - s->block_wrap[i]] || v->mb_type[0][s->block_index[i] - 1]) {
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if(((s->mb_y || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])
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|| ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {
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intrapred = 1;
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break;
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}
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