Check for out-of-bounds access

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7797 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

Check for out-of-bounds access
git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7797 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
adf1124b · kostya · 21a41098 · adf1124b
Commit adf1124b authored Feb 01, 2007 by kostya
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Showing with 2 additions and 2 deletions

libavcodec/vc1.c libavcodec/vc1.c +2 -2

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--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -2890,8 +2890,8 @@ static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int c
        ac_val -= 16 * s->block_wrap[n];

    q1 = s->current_picture.qscale_table[mb_pos];
-    if(dc_pred_dir && c_avail) q2 = s->current_picture.qscale_table[mb_pos - 1];
-    if(!dc_pred_dir && a_avail) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
+    if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];
+    if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
    if(n && n<4) q2 = q1;

    if(coded) {