Reland of https://codereview.webrtc.org/2044523002.

webrtc/test/fuzzers/stun_parser_fuzzer.cc

+/*
+ *  Copyright (c) 2016 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 <stddef.h>
+#include <stdint.h>
+
+#include "webrtc/p2p/base/stun.h"
+
+namespace webrtc {
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  const char* message = reinterpret_cast<const char*>(data);
+
+  // Normally we'd check the integrity first, but those checks are
+  // fuzzed separately in stun_validator_fuzzer.cc. We still want to
+  // fuzz this target since the integrity checks could be forged by a
+  // malicious adversary who receives a call.
+  std::unique_ptr<cricket::IceMessage> stun_msg(new cricket::IceMessage());
+  rtc::ByteBufferReader buf(message, size);
+  stun_msg->Read(&buf);
+}
+}  // namespace webrtc