1 files changed, 17 insertions, 0 deletions
diff --git a/test/asan/TestCases/Windows/malloc_left_oob.cc b/test/asan/TestCases/Windows/malloc_left_oob.cc
new file mode 100644
index 0000000000000..ec133c393da23
--- /dev/null
+++ b/test/asan/TestCases/Windows/malloc_left_oob.cc
@@ -0,0 +1,17 @@
+// RUN: %clang_cl_asan -O0 %s -Fe%t
+// RUN: not %run %t 2>&1 | FileCheck %s
+
+#include <malloc.h>
+
+int main() {
+  char *buffer = (char*)malloc(42);
+  buffer[-1] = 42;
+// CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
+// CHECK: WRITE of size 1 at [[ADDR]] thread T0
+// CHECK-NEXT: {{#0 .* main .*malloc_left_oob.cc}}:[[@LINE-3]]
+// CHECK: [[ADDR]] is located 1 bytes to the left of 42-byte region
+// CHECK: allocated by thread T0 here:
+// CHECK-NEXT: {{#0 .* malloc }}
+// CHECK-NEXT: {{#1 .* main .*malloc_left_oob.cc}}:[[@LINE-8]]
+  free(buffer);
+}