netdev - Re: [PATCH net-next] net: ethtool: phy: Clear the netdev context pointer for DUMP requests

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20240913091404.3d4a9d19@fedora.home>
Date: Fri, 13 Sep 2024 09:14:04 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com, Andrew Lunn
 <andrew@...n.ch>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Russell King <linux@...linux.org.uk>,
 linux-arm-kernel@...ts.infradead.org, Christophe Leroy
 <christophe.leroy@...roup.eu>, Herve Codina <herve.codina@...tlin.com>,
 Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit
 <hkallweit1@...il.com>, Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>, Jesse Brandeburg
 <jesse.brandeburg@...el.com>, Marek Behún
 <kabel@...nel.org>, Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
 Oleksij Rempel <o.rempel@...gutronix.de>, Nicolò Veronese
 <nicveronese@...il.com>, Simon Horman <horms@...nel.org>,
 mwojtas@...omium.org, Nathan Chancellor <nathan@...nel.org>, Antoine Tenart
 <atenart@...nel.org>, Marc Kleine-Budde <mkl@...gutronix.de>, Dan Carpenter
 <dan.carpenter@...aro.org>, Romain Gantois <romain.gantois@...tlin.com>,
 syzbot+e9ed4e4368d450c8f9db@...kaller.appspotmail.com
Subject: Re: [PATCH net-next] net: ethtool: phy: Clear the netdev context
 pointer for DUMP requests

Hello Jakub,

On Thu, 12 Sep 2024 20:44:38 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Wed, 11 Sep 2024 15:46:21 +0200 Maxime Chevallier wrote:
> > +		/* Clear the context netdev pointer so avoid a netdev_put from
> > +		 * the .done() callback
> > +		 */
> > +		ctx->phy_req_info->base.dev = NULL;  
> 
> Why do we assign to req_base.dev in the first place?
> req is for the parsed request in my mind, and I don't
> see anything in the PHY dump handlers actually using dev?

After reading the code back, that's true. It's just a leftover from
when I hadn't considered that dumps could be interrupted/resumed.

Let me clean that up then.

Thanks for the review Jakub,

Maxime