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1 // RUN: %clangxx_asan -O0 %s -o %t 2>&1
2 // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=MALLOC-CTX
3 
4 // Also works if no malloc context is available.
5 // RUN: env ASAN_OPTIONS=malloc_context_size=0:fast_unwind_on_malloc=0 not %run %t 2>&1 | FileCheck %s
6 // RUN: env ASAN_OPTIONS=malloc_context_size=0:fast_unwind_on_malloc=1 not %run %t 2>&1 | FileCheck %s
7 // XFAIL: arm-linux-gnueabi
8 // XFAIL: armv7l-unknown-linux-gnueabihf
9 
10 #include <stdlib.h>
11 #include <string.h>
main(int argc,char ** argv)12 int main(int argc, char **argv) {
13   char *x = (char*)malloc(10 * sizeof(char));
14   memset(x, 0, 10);
15   int res = x[argc];
16   free(x);
17   free(x + argc - 1);  // BOOM
18   // CHECK: AddressSanitizer: attempting double-free{{.*}}in thread T0
19   // CHECK: #0 0x{{.*}} in {{.*}}free
20   // CHECK: #1 0x{{.*}} in main {{.*}}double-free.cc:[[@LINE-3]]
21   // CHECK: freed by thread T0 here:
22   // MALLOC-CTX: #0 0x{{.*}} in {{.*}}free
23   // MALLOC-CTX: #1 0x{{.*}} in main {{.*}}double-free.cc:[[@LINE-7]]
24   // CHECK: allocated by thread T0 here:
25   // MALLOC-CTX: double-free.cc:[[@LINE-12]]
26   return res;
27 }
28