static int __netlink_remove_tap(struct netlink_tap *nt)
{
	bool found = false;
	struct netlink_tap *tmp;

	spin_lock(&netlink_tap_lock);

	list_for_each_entry(tmp, &netlink_tap_all, list) {
		if (nt == tmp) {
			list_del_rcu(&nt->list);
			found = true;
			goto out;
		}
	}

	pr_warn("__netlink_remove_tap: %p not found\n", nt);
out:
	spin_unlock(&netlink_tap_lock);

	if (found)
		module_put(nt->module);

	return found ? 0 : -ENODEV;
}

The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.