libvpx: Pull from upstream

source/libvpx/vp9/vp9_dx_iface.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 919 matching lines @@
 
   if (corrupted) {
     if (ctx->frame_workers) {
       VP9Worker *const worker = ctx->frame_workers;
       FrameWorkerData *const frame_worker_data =
           (FrameWorkerData *)worker->data1;
       RefCntBuffer *const frame_bufs =
           frame_worker_data->pbi->common.buffer_pool->frame_bufs;
       if (frame_worker_data->pbi->common.frame_to_show == NULL)
         return VPX_CODEC_ERROR;
-      *corrupted = frame_bufs[ctx->last_show_frame].buf.corrupted;
+      if (ctx->last_show_frame >= 0)
+        *corrupted = frame_bufs[ctx->last_show_frame].buf.corrupted;
       return VPX_CODEC_OK;
     } else {
       return VPX_CODEC_ERROR;
     }
   }
 
   return VPX_CODEC_INVALID_PARAM;
 }
 
 static vpx_codec_err_t ctrl_get_frame_size(vpx_codec_alg_priv_t *ctx,
@@ skipping 154 matching lines @@
     0,
     NULL,  // vpx_codec_enc_cfg_map_t
     NULL,  // vpx_codec_encode_fn_t
     NULL,  // vpx_codec_get_cx_data_fn_t
     NULL,  // vpx_codec_enc_config_set_fn_t
     NULL,  // vpx_codec_get_global_headers_fn_t
     NULL,  // vpx_codec_get_preview_frame_fn_t
     NULL   // vpx_codec_enc_mr_get_mem_loc_fn_t
   }
 };