net: ipv6: Fix UDP early demux lookup with udp_l3mdev_accept=0

#include <net/tcp_states.h>

#include <net/ip6_checksum.h>

#include <net/xfrm.h>

#include <net/inet_hashtables.h>

#include <net/inet6_hashtables.h>

#include <net/busy_poll.h>

#include <net/sock_reuseport.h>

	return 0;

}

static struct sock *__udp6_lib_demux_lookup(struct net *net,

			__be16 loc_port, const struct in6_addr *loc_addr,

			__be16 rmt_port, const struct in6_addr *rmt_addr,

			int dif)

{

	unsigned short hnum = ntohs(loc_port);

	unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum);

	unsigned int slot2 = hash2 & udp_table.mask;

	struct udp_hslot *hslot2 = &udp_table.hash2[slot2];

	const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);

	struct sock *sk;

	rcu_read_lock();

	sk = __udp6_lib_lookup(net, rmt_addr, rmt_port, loc_addr, loc_port,

			       dif, &udp_table, NULL);

	if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))

		sk = NULL;

	rcu_read_unlock();

	udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {

		if (INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif))

			return sk;

		/* Only check first socket in chain */

		break;

	}

	return NULL;

}

static void udp_v6_early_demux(struct sk_buff *skb)

	else

		return;

	if (!sk)

	if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2))

		return;

	skb->sk = sk;