Fix null-pointer dereference in RTPSenderVideo.

webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc

 /*
  *  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 212 matching lines @@
 }
 
 int32_t RTPSenderVideo::SendVideo(const RtpVideoCodecTypes videoType,
                                   const FrameType frameType,
                                   const int8_t payloadType,
                                   const uint32_t captureTimeStamp,
                                   int64_t capture_time_ms,
                                   const uint8_t* payloadData,
                                   const size_t payloadSize,
                                   const RTPFragmentationHeader* fragmentation,
                                   const RTPVideoHeader* rtpHdr) {

[stefan-webrtc, 2016/02/08 13:58:06]

Feel free to rename this to something better.

   if (payloadSize == 0) {
     return -1;
   }
 
-  rtc::scoped_ptr<RtpPacketizer> packetizer(
-      RtpPacketizer::Create(videoType, _rtpSender.MaxDataPayloadLength(),
-                            &(rtpHdr->codecHeader), frameType));
+  rtc::scoped_ptr<RtpPacketizer> packetizer(RtpPacketizer::Create(
+      videoType, _rtpSender.MaxDataPayloadLength(),
+      rtpHdr ? &(rtpHdr->codecHeader) : nullptr, frameType));
 
   StorageType storage;
   bool fec_enabled;
   {
     CriticalSectionScoped cs(crit_.get());
     FecProtectionParams* fec_params =
         frameType == kVideoFrameKey ? &key_fec_params_ : &delta_fec_params_;
     producer_fec_.SetFecParameters(fec_params, 0);
     storage = packetizer->GetStorageType(_retransmissionSettings);
     fec_enabled = fec_enabled_;
@@ skipping 99 matching lines @@
   CriticalSectionScoped cs(crit_.get());
   return _retransmissionSettings;
 }
 
 void RTPSenderVideo::SetSelectiveRetransmissions(uint8_t settings) {
   CriticalSectionScoped cs(crit_.get());
   _retransmissionSettings = settings;
 }
 
 }  // namespace webrtc