// use-after-free

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>

struct Link
{
    int          data;
    struct Link *next;
};

struct Link *newLink(int data, struct Link *next)
{
    struct Link *link = (struct Link *)malloc(sizeof(struct Link));
    link->data = data;
    link->next = next;
    return link;
}

int main()
{
    struct Link *list = 0;

    // create linked list of 10 elements
    for (int i = 0;  i < 10;  ++i)
	list = newLink(i*i, list);

    // print contents of list
    for (struct Link *ptr = list;  ptr;  ptr = ptr->next) {
	printf("%d\n", ptr->data);
    }

    // deallocate list
    for (struct Link *ptr = list;  ptr;  ptr = ptr->next) {
	free(ptr); // ptr is now dangling in the update expression
    }

    return 0;
}