1*673dc3d4SNico Weber // RUN: %clang_cl_asan -Od %s -Fe%t
2*673dc3d4SNico Weber // RUN: not %run %t 2>&1 | FileCheck %s
3*673dc3d4SNico Weber 
4*673dc3d4SNico Weber #include <malloc.h>
5*673dc3d4SNico Weber 
main()6*673dc3d4SNico Weber int main() {
7*673dc3d4SNico Weber   char *buffer = (char*)malloc(42);
8*673dc3d4SNico Weber   buffer[-1] = 42;
9*673dc3d4SNico Weber // CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
10*673dc3d4SNico Weber // CHECK: WRITE of size 1 at [[ADDR]] thread T0
11*673dc3d4SNico Weber // CHECK-NEXT: {{#0 .* main .*malloc_left_oob.cpp}}:[[@LINE-3]]
12*673dc3d4SNico Weber // CHECK: [[ADDR]] is located 1 bytes to the left of 42-byte region
13*673dc3d4SNico Weber // CHECK: allocated by thread T0 here:
14*673dc3d4SNico Weber // CHECK-NEXT: {{#0 .* malloc }}
15*673dc3d4SNico Weber // CHECK-NEXT: {{#1 .* main .*malloc_left_oob.cpp}}:[[@LINE-8]]
16*673dc3d4SNico Weber   free(buffer);
17*673dc3d4SNico Weber }
18