net: ethtool: Use hwprov under rcu_read_lock

net: ethtool: Use hwprov under rcu_read_lock

hwprov should be protected by rcu_read_lock to prevent possible UAF

Fixes: 4c61d809cf60 ("net: ethtool: Fix suspicious rcu_dereference usage")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Acked-by: Kory Maincent <kory.maincent@bootlin.com>
diff with v1: move and use err varialbe, instead of define a new variable

 net/ethtool/common.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Link: https://patch.msgid.link/20250109111057.4746-1-lirongqing@baidu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>