segfault.cpp

#include <iostream>

using namespace std;

struct node {
  int value;
  node* next;
};

int add_to_all(node** top_ref, int num) {
  node* cursor = *top_ref;
  do {
     cursor->value = cursor->value + num;
     cout << cursor->value << endl;
     cursor = cursor->next;
  } while (cursor != NULL);
}

int main() {
  node* top = NULL;
  add_to_all(&top, 42);
}