static void mntput_no_expire(struct mount *mnt)
{
	rcu_read_lock();
	mnt_add_count(mnt, -1);
	if (likely(mnt->mnt_ns)) { /* shouldn't be the last one */
		rcu_read_unlock();
		return;
	}
	lock_mount_hash();
	if (mnt_get_count(mnt)) {
		rcu_read_unlock();
		unlock_mount_hash();
		return;
	}
	if (unlikely(mnt->mnt.mnt_flags & MNT_DOOMED)) {
		rcu_read_unlock();
		unlock_mount_hash();
		return;
	}
	mnt->mnt.mnt_flags |= MNT_DOOMED;
	rcu_read_unlock();

	list_del(&mnt->mnt_instance);

	if (unlikely(!list_empty(&mnt->mnt_mounts))) {
		struct mount *p, *tmp;
		list_for_each_entry_safe(p, tmp, &mnt->mnt_mounts,  mnt_child) {
			umount_mnt(p);
		}
	}
	unlock_mount_hash();

	if (likely(!(mnt->mnt.mnt_flags & MNT_INTERNAL))) {
		struct task_struct *task = current;
		if (likely(!(task->flags & PF_KTHREAD))) {
			init_task_work(&mnt->mnt_rcu, __cleanup_mnt);
			if (!task_work_add(task, &mnt->mnt_rcu, true))
				return;
		}
		if (llist_add(&mnt->mnt_llist, &delayed_mntput_list))
			schedule_delayed_work(&delayed_mntput_work, 1);
		return;
	}
	cleanup_mnt(mnt);
}
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.