Log an error in RtpDemuxer::FindSsrcAssociations() if kMaxProcessedSsrcs exceeded

webrtc/call/rtp_demuxer.cc

 /*
  *  Copyright (c) 2017 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.
  */
 
+#include "webrtc/call/rtp_demuxer.h"
+
 #include "webrtc/base/checks.h"
-#include "webrtc/call/rtp_demuxer.h"
+#include "webrtc/base/logging.h"
 #include "webrtc/call/rtp_packet_sink_interface.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
 
 namespace webrtc {
 
 namespace {
 
 constexpr size_t kMaxProcessedSsrcs = 1000;  // Prevent memory overuse.
 
@@ skipping 88 matching lines @@
       RecordSsrcToSinkAssociation(packet.Ssrc(), it->second);
     }
 
     // To prevent memory-overuse attacks, forget this RSID. Future packets
     // with this RSID, but a different SSRC, will not spawn new associations.
     rsid_sinks_.erase(it_range.first, it_range.second);
   }
 
   if (processed_ssrcs_.size() < kMaxProcessedSsrcs) {  // Prevent memory overuse
     processed_ssrcs_.insert(packet.Ssrc());  // Avoid re-examining in-depth.
+  } else if (!logged_max_processed_ssrcs_exceeded_) {
+    LOG(LS_WARNING) << "More than " << kMaxProcessedSsrcs
+                    << " different SSRCs seen.";
+    logged_max_processed_ssrcs_exceeded_ = true;
   }
 }
 
 }  // namespace webrtc