1 files changed, 23 insertions, 0 deletions
diff --git a/lib/Fuzzer/test/BufferOverflowOnInput.cpp b/lib/Fuzzer/test/BufferOverflowOnInput.cpp
new file mode 100644
index 0000000000000..b9d14052aee47
--- /dev/null
+++ b/lib/Fuzzer/test/BufferOverflowOnInput.cpp
@@ -0,0 +1,23 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Simple test for a fuzzer. The fuzzer must find the string "Hi!".
+#include <assert.h>
+#include <cstdint>
+#include <cstdlib>
+#include <cstddef>
+#include <iostream>
+
+static volatile bool SeedLargeBuffer;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  assert(Data);
+  if (Size >= 4)
+    SeedLargeBuffer = true;
+  if (Size == 3 && SeedLargeBuffer && Data[3]) {
+    std::cout << "Woops, reading Data[3] w/o crashing\n";
+    exit(1);
+  }
+  return 0;
+}
+