vp9: sync threads after a longjmp

source/libvpx/vp9/decoder/vp9_decoder.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 223 matching lines @@
 
   pbi->ready_for_new_data = 0;
 
   // Check if the previous frame was a frame without any references to it.
   if (cm->new_fb_idx >= 0 && cm->frame_bufs[cm->new_fb_idx].ref_count == 0)
     cm->release_fb_cb(cm->cb_priv,
                       &cm->frame_bufs[cm->new_fb_idx].raw_frame_buffer);
   cm->new_fb_idx = get_free_fb(cm);
 
   if (setjmp(cm->error.jmp)) {
+    const VP9WorkerInterface *const winterface = vp9_get_worker_interface();
+    int i;
+
     pbi->need_resync = 1;
     cm->error.setjmp = 0;
+
+    // Synchronize all threads immediately as a subsequent decode call may
+    // cause a resize invalidating some allocations.
+    winterface->sync(&pbi->lf_worker);
+    for (i = 0; i < pbi->num_tile_workers; ++i) {
+      winterface->sync(&pbi->tile_workers[i]);
+    }
+
     vp9_clear_system_state();
 
     // We do not know if the missing frame(s) was supposed to update
     // any of the reference buffers, but we act conservative and
     // mark only the last buffer as corrupted.
     //
     // TODO(jkoleszar): Error concealment is undefined and non-normative
     // at this point, but if it becomes so, [0] may not always be the correct
     // thing to do here.
     if (cm->frame_refs[0].idx != INT_MAX && cm->frame_refs[0].buf != NULL)
@@ skipping 117 matching lines @@
 
         for (j = 0; j < mag; ++j)
           this_sz |= (*x++) << (j * 8);
         sizes[i] = this_sz;
       }
       *count = frames;
     }
   }
   return VPX_CODEC_OK;
 }