libvpx: Pull from upstream

source/libvpx/vp9/decoder/vp9_decoder.c

Index: source/libvpx/vp9/decoder/vp9_decoder.c
diff --git a/source/libvpx/vp9/decoder/vp9_decoder.c b/source/libvpx/vp9/decoder/vp9_decoder.c
index 288d8690ca244fb2c9ded53f629e83af974d66ae..7991a39e61019529a505966886d5251fb7f95524 100644
--- a/source/libvpx/vp9/decoder/vp9_decoder.c
+++ b/source/libvpx/vp9/decoder/vp9_decoder.c
@@ -50,7 +50,6 @@ static void initialize_dec(void) {
 
 static void vp9_dec_setup_mi(VP9_COMMON *cm) {
   cm->mi = cm->mip + cm->mi_stride + 1;
-  memset(cm->mip, 0, cm->mi_stride * (cm->mi_rows + 1) * sizeof(*cm->mip));
   cm->mi_grid_visible = cm->mi_grid_base + cm->mi_stride + 1;
   memset(cm->mi_grid_base, 0,
          cm->mi_stride * (cm->mi_rows + 1) * sizeof(*cm->mi_grid_base));
@@ -212,6 +211,9 @@ vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
 
     // Find an empty frame buffer.
     const int free_fb = get_free_fb(cm);
+    if (cm->new_fb_idx == INVALID_IDX)
+      return VPX_CODEC_MEM_ERROR;
+
     // Decrease ref_count since it will be increased again in
     // ref_cnt_fb() below.
     --frame_bufs[free_fb].ref_count;
@@ -299,7 +301,10 @@ int vp9_receive_compressed_data(VP9Decoder *pbi,
       && frame_bufs[cm->new_fb_idx].ref_count == 0)
     pool->release_fb_cb(pool->cb_priv,
                         &frame_bufs[cm->new_fb_idx].raw_frame_buffer);
+  // Find a free frame buffer. Return error if can not find any.
   cm->new_fb_idx = get_free_fb(cm);
+  if (cm->new_fb_idx == INVALID_IDX)
+    return VPX_CODEC_MEM_ERROR;
 
   // Assign a MV array to the frame buffer.
   cm->cur_frame = &pool->frame_bufs[cm->new_fb_idx];