1 // Check that free hook doesn't conflict with Realloc.
2 // RUN: %clangxx_asan -O2 %s -o %t
3 // RUN: %run %t 2>&1 | FileCheck %s
4 
5 #include <stdlib.h>
6 #include <unistd.h>
7 #include <sanitizer/allocator_interface.h>
8 
9 static void *glob_ptr;
10 
11 extern "C" {
__sanitizer_free_hook(const volatile void * ptr)12 void __sanitizer_free_hook(const volatile void *ptr) {
13   if (ptr == glob_ptr) {
14     *(int*)ptr = 0;
15     write(1, "FreeHook\n", sizeof("FreeHook\n"));
16   }
17 }
18 }
19 
main()20 int main() {
21   int *x = (int*)malloc(100);
22   x[0] = 42;
23   glob_ptr = x;
24   int *y = (int*)realloc(x, 200);
25   // Verify that free hook was called and didn't spoil the memory.
26   if (y[0] != 42) {
27     _exit(1);
28   }
29   write(1, "Passed\n", sizeof("Passed\n"));
30   free(y);
31   // CHECK: FreeHook
32   // CHECK: Passed
33   return 0;
34 }
35