linux-kernel - Re: [PATCH net-next v6 5/7] net: ethtool: Add new power limit get and set features

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Message-ID: <20240705184116.13d8235a@kernel.org>
Date: Fri, 5 Jul 2024 18:41:16 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Donald Hunter
 <donald.hunter@...il.com>, Oleksij Rempel <o.rempel@...gutronix.de>,
 Jonathan Corbet <corbet@....net>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, Dent Project <dentproject@...uxfoundation.org>,
 kernel@...gutronix.de, linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next v6 5/7] net: ethtool: Add new power limit get
 and set features

On Thu, 04 Jul 2024 10:12:00 +0200 Kory Maincent wrote:
> +	if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] ||
> +	    tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) {
> +		struct pse_control_config config = {};
> +
> +		if (pse_has_podl(phydev->psec))
> +			config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
> +		if (pse_has_c33(phydev->psec))
> +			config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);

This smells of null-deref if user only passes one of the attributes.
But the fix should probably be in ethnl_set_pse_validate() so it won't
conflict (I'm speculating that it will need to go to net).