Add protection for RTCPSender::max_packet_size_.

webrtc/modules/rtp_rtcp/source/rtcp_sender.h

 /*
  *  Copyright (c) 2012 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 220 matching lines @@
   uint8_t sequence_number_fir_ GUARDED_BY(critical_section_rtcp_sender_);
 
   // REMB
   uint32_t remb_bitrate_ GUARDED_BY(critical_section_rtcp_sender_);
   std::vector<uint32_t> remb_ssrcs_ GUARDED_BY(critical_section_rtcp_sender_);
 
   std::vector<rtcp::TmmbItem> tmmbn_to_send_
       GUARDED_BY(critical_section_rtcp_sender_);
   uint32_t tmmbr_send_bps_ GUARDED_BY(critical_section_rtcp_sender_);
   uint32_t packet_oh_send_ GUARDED_BY(critical_section_rtcp_sender_);
-  size_t max_packet_size_;
+  size_t max_packet_size_ GUARDED_BY(critical_section_rtcp_sender_);
 
   // APP
   uint8_t app_sub_type_ GUARDED_BY(critical_section_rtcp_sender_);
   uint32_t app_name_ GUARDED_BY(critical_section_rtcp_sender_);
   std::unique_ptr<uint8_t[]> app_data_
       GUARDED_BY(critical_section_rtcp_sender_);
   uint16_t app_length_ GUARDED_BY(critical_section_rtcp_sender_);
 
   // True if sending of XR Receiver reference time report is enabled.
   bool xr_send_receiver_reference_time_enabled_
@@ skipping 36 matching lines @@
   typedef std::unique_ptr<rtcp::RtcpPacket> (RTCPSender::*BuilderFunc)(
       const RtcpContext&);
   // Map from RTCPPacketType to builder.
   std::map<uint32_t, BuilderFunc> builders_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RTCPSender);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_SENDER_H_