1 files changed, 34 insertions, 0 deletions
diff --git a/libgo/misc/cgo/testsanitizers/testdata/asan2_fail.go b/libgo/misc/cgo/testsanitizers/testdata/asan2_fail.go
new file mode 100644
index 00000000000..3ab06085710
--- /dev/null
+++ b/libgo/misc/cgo/testsanitizers/testdata/asan2_fail.go
@@ -0,0 +1,34 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+/*
+#include <stdlib.h>
+#include <stdio.h>
+
+int *p;
+int* f() {
+  int i;
+  p = (int *)malloc(5*sizeof(int));
+  for (i = 0; i < 5; i++) {
+    p[i] = i+10;
+  }
+  return p;
+}
+*/
+import "C"
+import (
+	"fmt"
+	"unsafe"
+)
+
+func main() {
+	a := C.f()
+	q5 := (*C.int)(unsafe.Add(unsafe.Pointer(a), 4*5))
+	// Access to C pointer out of bounds.
+	*q5 = 100 // BOOM
+	// We shouldn't get here; asan should stop us first.
+	fmt.Printf("q5: %d, %x\n", *q5, q5)
+}