netdev - BUG at /net/ipx/af

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Date:   Sat, 15 Dec 2018 12:14:41 +0800 (CST)
From:   tenys <15667082669@....com>
To:     netdev@...r.kernel.org
Subject: BUG at /net/ipx/af_ipx.c


it looks like a pointer stored without holding a reference
for the source code  in kernel version v4.14.88, and the fuction is : ipxitf_insert_socket

static void ipxitf_insert_socket(struct ipx_interface *intrfc, struct sock *sk)
{	ipxitf_hold(intrfc);
	spin_lock_bh(&intrfc->if_sklist_lock);
	ipx_sk(sk)->intrfc = intrfc;
	sk_add_node(sk, &intrfc->if_sklist);
	spin_unlock_bh(&intrfc->if_sklist_lock);
	ipxitf_put(intrfc);
}

it assigned the pointer `intrfc` to `sk->intrfc`,  but didn't hold a reference for this pointer.
it looks like a bug.....if not ,could you please explain the meaning of it?
thanks a lot！