1 files changed, 27 insertions, 0 deletions
diff --git a/compiler-rt/test/fuzzer/ImplicitUnsignedIntegerTruncationTest.cpp b/compiler-rt/test/fuzzer/ImplicitUnsignedIntegerTruncationTest.cpp
new file mode 100644
index 00000000000..aeb77221cf1
--- /dev/null
+++ b/compiler-rt/test/fuzzer/ImplicitUnsignedIntegerTruncationTest.cpp
@@ -0,0 +1,27 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Test for unsigned-integer-overflow.
+#include <assert.h>
+#include <climits>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <iostream>
+
+static volatile int Sink;
+static unsigned char Large = UINT8_MAX;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  assert(Data);
+  if (Size > 0 && Data[0] == 'H') {
+    Sink = 1;
+    if (Size > 1 && Data[1] == 'i') {
+      Sink = 2;
+      if (Size > 2 && Data[2] == '!') {
+        Large = (unsigned int)Large + 1U;  // 'char overflow'.
+      }
+    }
+  }
+  return 0;
+}