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      1 // RUN: %clang_cl_asan -O0 %p/dll_host.cc -Fe%t
      2 // RUN: %clang_cl_asan -LD -O0 %s -Fe%t.dll
      3 // RUN: not %run %t %t.dll 2>&1 | FileCheck %s
      4 
      5 #include <malloc.h>
      6 
      7 extern "C" __declspec(dllexport)
      8 int test_function() {
      9   int *buffer = (int*)malloc(42);
     10   free(buffer);
     11   buffer[0] = 42;
     12 // CHECK: AddressSanitizer: heap-use-after-free on address [[ADDR:0x[0-9a-f]+]]
     13 // CHECK: WRITE of size 4 at [[ADDR]] thread T0
     14 // CHECK-NEXT:  test_function {{.*}}dll_malloc_uaf.cc:[[@LINE-3]]
     15 // CHECK-NEXT:  main {{.*}}dll_host
     16 //
     17 // CHECK: [[ADDR]] is located 0 bytes inside of 42-byte region
     18 // CHECK-LABEL: freed by thread T0 here:
     19 // CHECK-NEXT:  free
     20 // CHECK-NEXT:  test_function {{.*}}dll_malloc_uaf.cc:[[@LINE-10]]
     21 // CHECK-NEXT:  main {{.*}}dll_host
     22 //
     23 // CHECK-LABEL: previously allocated by thread T0 here:
     24 // CHECK-NEXT:  malloc
     25 // CHECK-NEXT:  test_function {{.*}}dll_malloc_uaf.cc:[[@LINE-16]]
     26 // CHECK-NEXT:  main {{.*}}dll_host
     27   return 0;
     28 }
     29