Don't touch the renderer without the lock!

media/base/pipeline.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/pipeline.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 588 matching lines @@
   renderer_ended_ = false;
   text_renderer_ended_ = false;
   start_timestamp_ = seek_timestamp;
 
   DoSeek(seek_timestamp, base::Bind(&Pipeline::StateTransitionTask,
                                     weak_factory_.GetWeakPtr()));
 }
 
 void Pipeline::SetCdmTask(CdmContext* cdm_context,
                           const CdmAttachedCB& cdm_attached_cb) {
+  base::AutoLock auto_lock(lock_);
   if (!renderer_) {
     pending_cdm_context_ = cdm_context;
     cdm_attached_cb.Run(true);
     return;
   }
 
   renderer_->SetCdm(cdm_context, cdm_attached_cb);
 }
 
 void Pipeline::OnRendererEnded() {
@@ skipping 121 matching lines @@
   metadata_cb_.Run(metadata);
 }
 
 void Pipeline::BufferingStateChanged(BufferingState new_buffering_state) {
   DVLOG(1) << __FUNCTION__ << "(" << new_buffering_state << ") ";
   DCHECK(task_runner_->BelongsToCurrentThread());
   buffering_state_cb_.Run(new_buffering_state);
 }
 
 }  // namespace media