linux-kernel - [PATCH net 0/2] net: ethtool: netlink: Fix notifications for

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Message-ID: <20250227182454.1998236-1-maxime.chevallier@bootlin.com>
Date: Thu, 27 Feb 2025 19:24:50 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: davem@...emloft.net,
	Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com,
	linux-arm-kernel@...ts.infradead.org,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Herve Codina <herve.codina@...tlin.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Simon Horman <horms@...nel.org>,
	Romain Gantois <romain.gantois@...tlin.com>,
	Piergiorgio Beruto <piergiorgio.beruto@...il.com>
Subject: [PATCH net 0/2] net: ethtool: netlink: Fix notifications for

It has been found (thanks to Parthiban) that the PLCA ethtool commands
were failing since 6.12, due to the phy_link_topology work. This was
traced back to the ethnl notifications mechanism, in which calls to
ethnl_req_get_phydev() crashed in the notification path following a
->set request.

The typical callsite for ethnl_req_get_phydev() looks like :

    phydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_XXX_HEADER],
				  info->extack);

as 'tb' is NULL in the notification path for the ->prepare_data ethnl
ops, this causes crashes. The solution for that is to change the
prototype of ethnl_req_get_phydev() to perform checks inside the helper
(patch 1).

While investigating that, I realised that the notification path for PHYs
is not correct anyways. As we don't have a netlink request to parse, we
can't know for sure which PHY the notification event targets in the case
of a notification following a ->set request.

Patch 2 introduces a context structure that is used between ->set
requests and the followup notification, to keep track of the PHY that
the original request targeted for the notification.

Thanks Parthiban for the report (not on netdev@ though).

Maxime

Maxime Chevallier (2):
  net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device
  net: ethtool: netlink: Pass a context for default ethnl notifications

 net/ethtool/cabletest.c |  8 ++++----
 net/ethtool/linkstate.c |  2 +-
 net/ethtool/netlink.c   | 21 +++++++++++++++++----
 net/ethtool/netlink.h   |  5 +++--
 net/ethtool/phy.c       |  2 +-
 net/ethtool/plca.c      |  6 +++---
 net/ethtool/pse-pd.c    |  4 ++--
 net/ethtool/stats.c     |  2 +-
 net/ethtool/strset.c    |  2 +-
 9 files changed, 33 insertions(+), 19 deletions(-)

-- 
2.48.1