futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
{
	struct futex_hash_bucket *hb;
	struct futex_q *this, *next;
	union futex_key key = FUTEX_KEY_INIT;
	int ret;
	DEFINE_WAKE_Q(wake_q);

	if (!bitset)
		return -EINVAL;

	ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, VERIFY_READ);
	if (unlikely(ret != 0))
		goto out;

	hb = hash_futex(&key);

	/* Make sure we really have tasks to wakeup */
	if (!hb_waiters_pending(hb))
		goto out_put_key;

	spin_lock(&hb->lock);

	plist_for_each_entry_safe(this, next, &hb->chain, list) {
		if (match_futex (&this->key, &key)) {
			if (this->pi_state || this->rt_waiter) {
				ret = -EINVAL;
				break;
			}

			/* Check if one of the bits is set in both bitsets */
			if (!(this->bitset & bitset))
				continue;

			mark_wake_futex(&wake_q, this);
			if (++ret >= nr_wake)
				break;
		}
	}

	spin_unlock(&hb->lock);
	wake_up_q(&wake_q);
out_put_key:
	put_futex_key(&key);
out:
	return ret;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.