netlink: remove hash::nelems check in netlink_insert

stable inclusion
from stable-v4.19.272
commit bc6199018f7b1b1fca9d6d3a746101d72859c332
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6KOHU
CVE: NA

--------------------------------

[ Upstream commit 0041195d ]

The type of hash::nelems has been changed from size_t to atom_t
which in fact is int, so not need to check if BITS_PER_LONG, that
is bit number of size_t, is bigger than 32

and rht_grow_above_max() will be called to check if hashtable is
too big, ensure it can not bigger than 1<<31
Signed-off-by: NZhang Yu <zhangyu31@baidu.com>
Signed-off-by: NLi RongQing <lirongqing@baidu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Stable-dep-of: c1bb9484 ("netlink: annotate data races around nlk->portid")
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

net/netlink/af_netlink.c

@@ -578,11 +578,6 @@ static int netlink_insert(struct sock *sk, u32 portid)
 	if (nlk_sk(sk)->bound)
 		goto err;
 
-	err = -ENOMEM;
-	if (BITS_PER_LONG > 32 &&
-	    unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX))
-		goto err;
-
 	nlk_sk(sk)->portid = portid;
 	sock_hold(sk);