libvpx: Pull from upstream

source/libvpx/vp8/common/postproc.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 285 matching lines @@
         for (r = 0; r < rows + 8; r++)
         {
             sumsq += s[7*pitch] * s[ 7*pitch] - s[-8*pitch] * s[-8*pitch];
             sum  += s[7*pitch] - s[-8*pitch];
             d[r&15] = s[0];
 
             if (sumsq * 15 - sum * sum < flimit)
             {
                 d[r&15] = (rv2[r&127] + sum + s[0]) >> 4;
             }
-
-            s[-8*pitch] = d[(r-8)&15];
+            if (r >= 8)
+              s[-8*pitch] = d[(r-8)&15];
             s += pitch;
         }
     }
 }
 
 static void vp8_de_mblock(YV12_BUFFER_CONFIG         *post,
                           int                         q)
 {
     vp8_mbpost_proc_across_ip(post->y_buffer, post->y_stride, post->y_height,
                               post->y_width, q2mbl(q));
@@ skipping 874 matching lines @@
 
     *dest = oci->post_proc_buffer;
 
     /* handle problem with extending borders */
     dest->y_width = oci->Width;
     dest->y_height = oci->Height;
     dest->uv_height = dest->y_height / 2;
     return 0;
 }
 #endif