netlink: annotate data races around dst_portid and dst_group

stable inclusion
from stable-v4.19.272
commit 71bd90357ee93482922ea1ec73cd72271a825fec
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6KOHU


CVE: NA

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

[ Upstream commit 004db64d ]

netlink_getname(), netlink_sendmsg() and netlink_getsockbyportid()
can read nlk->dst_portid and nlk->dst_group while another
thread is changing them.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>