Question

If i allocate a void pointer like this, then i get an access violation while trying to free the pointer.

int Foo(void* ptr)
{
     *((void**)ptr) = malloc(25);
     ((char*)ptr)[0] = 'A';
     free(ptr); //crashes access violation
}

The same happens if i pass a void pointer to the function and tries to free it outside of the function

int main()
{
     void* ptr;
     Foo(&ptr);
     printf("%s \n", (char*)&ptr); //works
     free(ptr); //crashes access violation
     retun 0;
}

any clues how to free this pointer?

Answer 1

You are not trying to free the same pointer, try free(*((void**)ptr));