1// RUN: %clang_cl_asan -O0 %s -Fe%t
2// RUN: not %run %t 2>&1 | FileCheck %s
3
4class Parent {
5 public:
6  int field;
7};
8
9class Child : public Parent {
10 public:
11  int extra_field;
12};
13
14int main(void) {
15  Parent *p = new Parent;
16  Child *c = (Child*)p;  // Intentional error here!
17  c->extra_field = 42;
18// CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
19// CHECK: WRITE of size 4 at [[ADDR]] thread T0
20// CHECK:   {{#0 0x[0-9a-f]* in main .*wrong_downcast_on_heap.cc}}:[[@LINE-3]]
21// CHECK: [[ADDR]] is located 0 bytes to the right of 4-byte region
22// CHECK: allocated by thread T0 here:
23// CHECK:   #0 {{.*}} operator new
24  return 0;
25}
26
27