linux-kernel - Re: [PATCH net-next v18 07/13] net: ethtool: Introduce a command to list PHYs on an interface

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Message-ID: <CANn89iKRW0WpGAh1tKqY345D8WkYCPm3Y9ym--Si42JZrQAu1g@mail.gmail.com>
Date: Tue, 10 Sep 2024 19:23:30 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>, 
	Jakub Kicinski <kuba@...nel.org>, 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>
Subject: Re: [PATCH net-next v18 07/13] net: ethtool: Introduce a command to
 list PHYs on an interface

On Tue, Sep 10, 2024 at 7:20 PM Maxime Chevallier
<maxime.chevallier@...tlin.com> wrote:
>
> Hello Eric,
>
> On Tue, 10 Sep 2024 18:41:03 +0200
> Eric Dumazet <edumazet@...gle.com> wrote:
>
> > > +int ethnl_phy_doit(struct sk_buff *skb, struct genl_info *info)
> > > +{
> > > +       struct phy_req_info req_info = {};
> > > +       struct nlattr **tb = info->attrs;
> > > +       struct sk_buff *rskb;
> > > +       void *reply_payload;
> > > +       int reply_len;
> > > +       int ret;
> > > +
> > > +       ret = ethnl_parse_header_dev_get(&req_info.base,
> > > +                                        tb[ETHTOOL_A_PHY_HEADER],
> > > +                                        genl_info_net(info), info->extack,
> > > +                                        true);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       rtnl_lock();
> > > +
> > > +       ret = ethnl_phy_parse_request(&req_info.base, tb, info->extack);
> > > +       if (ret < 0)
> > > +               goto err_unlock_rtnl;
> > > +
> > > +       /* No PHY, return early */
> >
> > I got a syzbot report here.
>
> I seem to have missed the report, sorry about that.
>
> >
> > Should we fix this with :
> >
> > diff --git a/net/ethtool/phy.c b/net/ethtool/phy.c
> > index 560dd039c6625ac0925a0f28c14ce77cf768b6a5..4ef7c6e32d1087dc71acb467f9cd2ab8faf4dc39
> > 100644
> > --- a/net/ethtool/phy.c
> > +++ b/net/ethtool/phy.c
> > @@ -164,7 +164,7 @@ int ethnl_phy_doit(struct sk_buff *skb, struct
> > genl_info *info)
> >                 goto err_unlock_rtnl;
> >
> >         /* No PHY, return early */
> > -       if (!req_info.pdn->phy)
> > +       if (!req_info.pdn)
> >                 goto err_unlock_rtnl;
> >
> >         ret = ethnl_phy_reply_size(&req_info.base, info->extack);
> >
> >
>
> Indeed that's the correct fix. Should I send it ? ( including
> suggested-by/reported-by )

Yes please, go ahead.

>
> Thanks,
>
> Maxime