--- /dev/null
+//===--- DummyYAMLParserFuzzer.cpp ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of main so we can build and test without linking libFuzzer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/FuzzMutate/FuzzerCLI.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+int main(int argc, char *argv[]) {
+ return llvm::runFuzzerOnInputs(argc, argv, LLVMFuzzerTestOneInput);
+}
--- /dev/null
+//===-- yaml-parser-fuzzer.cpp - Fuzzer for YAML parser -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/YAMLParser.h"
+
+using namespace llvm;
+
+static bool isValidYaml(const uint8_t *Data, size_t Size) {
+ SourceMgr SM;
+ yaml::Stream Stream(StringRef(reinterpret_cast<const char *>(Data), Size),
+ SM);
+ return Stream.validate();
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+ std::vector<uint8_t> Input(Data, Data + Size);
+
+ // Ensure we don't crash on byte strings where the only null character is
+ // one-past-the-end of the actual input to the parser.
+ Input.erase(std::remove(Input.begin(), Input.end(), 0), Input.end());
+ Input.push_back(0);
+ Input.shrink_to_fit();
+ isValidYaml(Input.data(), Input.size() - 1);
+
+ return 0;
+}