1 // Test basic realloc functionality.
2 // RUN: %clang_hwasan %s -o %t && %run %t
3 // RUN: %clang_hwasan %s -DREALLOCARRAY -o %t && %run %t
4 
5 #include <assert.h>
6 #include <sanitizer/hwasan_interface.h>
7 
8 #ifdef REALLOCARRAY
9 extern "C" void *reallocarray(void *, size_t nmemb, size_t size);
10 #define REALLOC(p, s) reallocarray(p, 1, s)
11 #else
12 #include <stdlib.h>
13 #define REALLOC(p, s) realloc(p, s)
14 #endif
15 
16 int main() {
17   __hwasan_enable_allocator_tagging();
18   char *x = (char*)REALLOC(nullptr, 4);
19   x[0] = 10;
20   x[1] = 20;
21   x[2] = 30;
22   x[3] = 40;
23   char *x1 = (char*)REALLOC(x, 5);
24   assert(x1 != x);  // not necessary true for C,
25                     // but true today for hwasan.
26   assert(x1[0] == 10 && x1[1] == 20 && x1[2] == 30 && x1[3] == 40);
27   x1[4] = 50;
28 
29   char *x2 = (char*)REALLOC(x1, 6);
30   x2[5] = 60;
31   assert(x2 != x1);
32   assert(x2[0] == 10 && x2[1] == 20 && x2[2] == 30 && x2[3] == 40 &&
33          x2[4] == 50 && x2[5] == 60);
34 
35   char *x3 = (char*)REALLOC(x2, 6);
36   assert(x3 != x2);
37   assert(x3[0] == 10 && x3[1] == 20 && x3[2] == 30 && x3[3] == 40 &&
38          x3[4] == 50 && x3[5] == 60);
39 
40   char *x4 = (char*)REALLOC(x3, 5);
41   assert(x4 != x3);
42   assert(x4[0] == 10 && x4[1] == 20 && x4[2] == 30 && x4[3] == 40 &&
43          x4[4] == 50);
44 }
45