1// RUN: %clang_cl_asan -O0 %s -Fe%t
2// RUN: not %run %t 2>&1 | FileCheck %s
3
4#include <windows.h>
5
6typedef struct _S {
7  unsigned int bf1:1;
8  unsigned int bf2:2;
9  unsigned int bf3:3;
10  unsigned int bf4:4;
11} S;
12
13void make_access(S *s) {
14  s->bf2 = 2;
15// CHECK: AddressSanitizer: heap-use-after-free on address [[ADDR:0x[0-9a-f]+]]
16// CHECK: READ of size {{[124]}} at [[ADDR]]
17// CHECK:   {{#0 .* make_access .*bitfield_uaf.cc}}:[[@LINE-3]]
18// CHECK:   {{#1 .* main}}
19}
20
21int main(void) {
22  S *s = (S*)malloc(sizeof(S));
23  free(s);
24// CHECK: [[ADDR]] is located 0 bytes inside of 4-byte region
25// CHECK-LABEL: freed by thread T0 here:
26// CHECK:   {{#0 .* free }}
27// CHECK:   {{#1 .* main .*bitfield_uaf.cc}}:[[@LINE-4]]
28// CHECK-LABEL: previously allocated by thread T0 here:
29// CHECK:   {{#0 .* malloc }}
30// CHECK:   {{#1 .* main .*bitfield_uaf.cc}}:[[@LINE-8]]
31  make_access(s);
32  return 0;
33}
34
35