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Check for out-of-bounds access
Originally committed as revision 7797 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -2890,8 +2890,8 @@ static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int c
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ac_val -= 16 * s->block_wrap[n];
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q1 = s->current_picture.qscale_table[mb_pos];
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if(dc_pred_dir && c_avail) q2 = s->current_picture.qscale_table[mb_pos - 1];
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if(!dc_pred_dir && a_avail) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
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if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];
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if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
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if(n && n<4) q2 = q1;
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if(coded) {
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