netdev - [PATCH net] net: ethtool: pse-pd: Fix possible null-deref

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Message-Id: <20240709131201.166421-1-kory.maincent@bootlin.com>
Date: Tue,  9 Jul 2024 15:12:01 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: "Kory Maincent (Dent Project)" <kory.maincent@...tlin.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Andrew Lunn <andrew@...n.ch>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	thomas.petazzoni@...tlin.com,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net] net: ethtool: pse-pd: Fix possible null-deref

Fix a possible null dereference when a PSE supports both c33 and PoDL, but
only one of the netlink attributes is specified. The c33 or PoDL PSE
capabilities are already validated in the ethnl_set_pse_validate() call.

Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
Reported-by: Jakub Kicinski <kuba@...nel.org>
Closes: https://lore.kernel.org/netdev/20240705184116.13d8235a@kernel.org/
Fixes: 4d18e3ddf427 ("net: ethtool: pse-pd: Expand pse commands with the PSE PoE interface")
---
 net/ethtool/pse-pd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
index 2c981d443f27..9dc70eb50039 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -178,9 +178,9 @@ ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
 
 	phydev = dev->phydev;
 	/* These values are already validated by the ethnl_pse_set_policy */
-	if (pse_has_podl(phydev->psec))
+	if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL])
 		config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
-	if (pse_has_c33(phydev->psec))
+	if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL])
 		config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
 
 	/* Return errno directly - PSE has no notification */
-- 
2.34.1