netdev - [patch net-next v2] net: ethtool: fix unheld rtnl lock

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Message-ID: <20240826140628.99849-1-djahchankoike@gmail.com>
Date: Mon, 26 Aug 2024 11:06:13 -0300
From: Diogo Jahchan Koike <djahchankoike@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Diogo Jahchan Koike <djahchankoike@...il.com>,
	syzbot+ec369e6d58e210135f71@...kaller.appspotmail.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [patch net-next v2] net: ethtool: fix unheld rtnl lock

ethnl_req_get_phydev should be called with rtnl lock held.

Reported-by: syzbot+ec369e6d58e210135f71@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=ec369e6d58e210135f71
Fixes: 31748765bed3 ("net: ethtool: pse-pd: Target the command to the requested PHY")
Signed-off-by: Diogo Jahchan Koike <djahchankoike@...il.com>
---
 net/ethtool/pse-pd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
index 507cb21d6bf0..0cd298851ea1 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -227,8 +227,11 @@ ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info)
 	struct nlattr **tb = info->attrs;
 	struct phy_device *phydev;
 
+	rtnl_lock();
 	phydev = ethnl_req_get_phydev(req_info, tb[ETHTOOL_A_PSE_HEADER],
 				      info->extack);
+	rtnl_unlock();
+
 	if (IS_ERR_OR_NULL(phydev)) {
 		NL_SET_ERR_MSG(info->extack, "No PHY is attached");
 		return -EOPNOTSUPP;
-- 
2.43.0