CODEWITHSUNDEEP
c++c++11valgrind
cjmaria
cjmaria

Reputation: 340

Confused about Valgrind errors after deleting off heap

I have a very simple piece of code:

#include <iostream>

int main()
{
    int *val = new int;
    *val = 12;
    std::cout << *val << std::endl;
    delete &val;
    return 0;
}

When I run Valgrind on this, I get the following error:

SUMMARY: 3 errors from 3 contexts (suppressed: 8 from 8)

1 errors in context 1 of 3:
Invalid free() / delete / delete[] / realloc()
    at 0x1000ABB6D: free (vg_replace_malloc.c:533)
    by 0x100000D1E: main (pointers.cpp:8)
  Address 0x1048a09f0 is on thread 1's stack
  in frame #1, created by main (pointers.cpp:4)

What is wrong with how I am deleting val?

Upvotes: 0

Views: 115

Answers (1)

kiran Biradar
kiran Biradar

Reputation: 12732

You get invalid free() error if you try to free invalid memory.

delete &val;

here you are trying to delete address of val, rather than the memory val points to, which is wrong. Try as below instead.

delete val;

Upvotes: 5

Related Questions