Avoid memory corruption in sessions sync

chrome/browser/sync/sessions/sessions_sync_manager.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_SYNC_SESSIONS_SESSIONS_SYNC_MANAGER_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_SESSIONS_SYNC_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 305 matching lines @@
   void AssociateRestoredPlaceholderTab(
       const SyncedTabDelegate& tab_delegate,
       SessionID::id_type new_tab_id,
       const syncer::SyncDataList& restored_tabs,
       syncer::SyncChangeList* change_output);
 
   // Stops and re-starts syncing to rebuild association mappings.
   // See |local_tab_pool_out_of_sync_|.
   void RebuildAssociations();
 
+  // Validates the content of a SessionHeader protobuf.
+  // Returns false if validation fails.
+  static bool IsValidSessionHeader(const sync_pb::SessionHeader& header);
+
   // Mapping of current open (local) tabs to their sync identifiers.
   TabLinksMap local_tab_map_;
 
   SyncedSessionTracker session_tracker_;
   FaviconCache favicon_cache_;
 
   // Pool of used/available sync nodes associated with local tabs.
   TabNodePool local_tab_pool_;
 
   // Tracks whether our local representation of which sync nodes map to what
@@ skipping 31 matching lines @@
 
   scoped_ptr<LocalSessionEventRouter> local_event_router_;
   scoped_ptr<SyncedWindowDelegatesGetter> synced_window_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionsSyncManager);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SESSIONS_SYNC_MANAGER_H_