diff --git a/test/external_frame_buffer_test.cc b/test/external_frame_buffer_test.cc
index 44eba3317..70b300928 100644
--- a/test/external_frame_buffer_test.cc
+++ b/test/external_frame_buffer_test.cc
@@ -71,6 +71,7 @@ class ExternalFrameBufferList {
     if (ext_fb_list_[idx].size < min_size) {
       delete [] ext_fb_list_[idx].data;
       ext_fb_list_[idx].data = new uint8_t[min_size];
+      memset(ext_fb_list_[idx].data, 0, min_size);
       ext_fb_list_[idx].size = min_size;
     }
 
diff --git a/vp9/common/vp9_frame_buffers.c b/vp9/common/vp9_frame_buffers.c
index 733b3a927..34795b74e 100644
--- a/vp9/common/vp9_frame_buffers.c
+++ b/vp9/common/vp9_frame_buffers.c
@@ -61,6 +61,10 @@ int vp9_get_frame_buffer(void *cb_priv, size_t min_size,
     if (!int_fb_list->int_fb[i].data)
       return -1;
 
+    // This memset is needed for fixing valgrind error from C loop filter
+    // due to access uninitialized memory in frame border. It could be
+    // removed if border is totally removed.
+    vpx_memset(int_fb_list->int_fb[i].data, 0, min_size);
     int_fb_list->int_fb[i].size = min_size;
   }
 
diff --git a/vpx/vpx_frame_buffer.h b/vpx/vpx_frame_buffer.h
index e69df4bc8..41038b10d 100644
--- a/vpx/vpx_frame_buffer.h
+++ b/vpx/vpx_frame_buffer.h
@@ -43,15 +43,15 @@ typedef struct vpx_codec_frame_buffer {
  *
  * This callback is invoked by the decoder to retrieve data for the frame
  * buffer in order for the decode call to complete. The callback must
- * allocate at least min_size in bytes and assign it to fb->data. Then the
- * callback must set fb->size to the allocated size. The application does not
- * need to align the allocated data. The callback is triggered when the
- * decoder needs a frame buffer to decode a compressed image into. This
- * function may be called more than once for every call to vpx_codec_decode.
- * The application may set fb->priv to some data which will be passed
- * back in the ximage and the release function call. |fb| is guaranteed to
- * not be NULL. On success the callback must return 0. Any failure the
- * callback must return a value less than 0.
+ * allocate at least min_size in bytes and assign it to fb->data. The callback
+ * must zero out all the data allocated. Then the callback must set fb->size
+ * to the allocated size. The application does not need to align the allocated
+ * data. The callback is triggered when the decoder needs a frame buffer to
+ * decode a compressed image into. This function may be called more than once
+ * for every call to vpx_codec_decode. The application may set fb->priv to
+ * some data which will be passed back in the ximage and the release function
+ * call. |fb| is guaranteed to not be NULL. On success the callback must
+ * return 0. Any failure the callback must return a value less than 0.
  *
  * \param[in] priv         Callback's private data
  * \param[in] new_size     Size in bytes needed by the buffer
diff --git a/vpx_scale/generic/yv12config.c b/vpx_scale/generic/yv12config.c
index 70d7ac0c8..475d231e1 100644
--- a/vpx_scale/generic/yv12config.c
+++ b/vpx_scale/generic/yv12config.c
@@ -199,11 +199,6 @@ int vp9_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
       if (fb->data == NULL || fb->size < external_frame_size)
         return -1;
 
-      // This memset is needed for fixing valgrind error from C loop filter
-      // due to access uninitialized memory in frame border. It could be
-      // removed if border is totally removed.
-      vpx_memset(fb->data, 0, fb->size);
-
       ybf->buffer_alloc = (uint8_t *)yv12_align_addr(fb->data, 32);
     } else if (frame_size > (size_t)ybf->buffer_alloc_sz) {
       // Allocation to hold larger frame, or first allocation.
diff --git a/vpxdec.c b/vpxdec.c
index 091522f06..cf23c295e 100644
--- a/vpxdec.c
+++ b/vpxdec.c
@@ -384,7 +384,7 @@ int get_vp9_frame_buffer(void *cb_priv, size_t min_size,
 
   if (ext_fb_list->ext_fb[i].size < min_size) {
     free(ext_fb_list->ext_fb[i].data);
-    ext_fb_list->ext_fb[i].data = (uint8_t *)malloc(min_size);
+    ext_fb_list->ext_fb[i].data = (uint8_t *)calloc(min_size, sizeof(uint8_t));
     if (!ext_fb_list->ext_fb[i].data)
       return -1;