Fix a bug when we can't get default address

webrtc/p2p/base/stunport.h

 /*
  *  Copyright 2004 The WebRTC 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 131 matching lines @@
                     const rtc::SentPacket& sent_packet);
 
   void OnReadyToSend(rtc::AsyncPacketSocket* socket);
 
   // This method will send STUN binding request if STUN server address is set.
   void MaybePrepareStunCandidate();
 
   void SendStunBindingRequests();
 
   // Helper function which will set |addr|'s IP to the default local address if
-  // |addr| is the "any" address and |emit_local_for_anyaddress_| is true.
-  void MaybeSetDefaultLocalAddress(rtc::SocketAddress* addr) const;
+  // |addr| is the "any" address and |emit_local_for_anyaddress_| is true. When
+  // returning false, it indicates that the operation has failed and the
+  // address shouldn't be used by any candidate.
+  bool MaybeSetDefaultLocalAddress(rtc::SocketAddress* addr) const;
 
  private:
   // A helper class which can be called repeatedly to resolve multiple
   // addresses, as opposed to rtc::AsyncResolverInterface, which can only
   // resolve one address per instance.
   class AddressResolver : public sigslot::has_slots<> {
    public:
     explicit AddressResolver(rtc::PacketSocketFactory* factory);
     ~AddressResolver();
 
@@ skipping 108 matching lines @@
                 false) {
     // UDPPort will set these to local udp, updating these to STUN.
     set_type(STUN_PORT_TYPE);
     set_server_addresses(servers);
   }
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_STUNPORT_H_