1// RUN: %clang_cl_asan -O0 %s -Fe%t
2// RUN: not %run %t 2>&1 | FileCheck %s
3
4#include <malloc.h>
5
6int main() {
7  char *buffer = (char*)realloc(0, 42);
8  buffer[-1] = 42;
9// CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
10// CHECK: WRITE of size 1 at [[ADDR]] thread T0
11// CHECK-NEXT: {{#0 .* main .*realloc_left_oob.cc}}:[[@LINE-3]]
12// CHECK: [[ADDR]] is located 1 bytes to the left of 42-byte region
13// CHECK: allocated by thread T0 here:
14// CHECK-NEXT: {{#0 .* realloc }}
15// CHECK-NEXT: {{#1 .* main .*realloc_left_oob.cc}}:[[@LINE-8]]
16  free(buffer);
17}
18