linux-kernel - Re: [PATCH net-next] net: ethtool: phy: Don't set the context dev pointer for unfiltered DUMP

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Message-ID: <14e6f307-1aaa-4862-a22f-4833fc18920a@linux.dev>
Date: Fri, 13 Sep 2024 17:40:52 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>,
 Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
 Jakub Kicinski <kuba@...nel.org>, 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>,
 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, davem@...emloft.net
Subject: Re: [PATCH net-next] net: ethtool: phy: Don't set the context dev
 pointer for unfiltered DUMP

On 13/09/2024 11:05, Maxime Chevallier wrote:
> The context info allows continuing DUMP requests, shall they fill the
> netlink buffer.
> 
> In the case of filtered DUMP requests, a reference on the netdev is
> grabbed in the .start() callback and release in .done().
> 
> Unfiltered DUMP request don't need the dev pointer to be set in the context
> info, doing so will trigger an unwanted netdev_put() in .done().
> 
> Reported-by: syzbot+e9ed4e4368d450c8f9db@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/netdev/000000000000d3bf150621d361a7@google.com/
> Fixes: 17194be4c8e1 ("net: ethtool: Introduce a command to list PHYs on an interface")
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> ---
> This patch fixes a commit that still lives in net-next.
> 
>   net/ethtool/phy.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/net/ethtool/phy.c b/net/ethtool/phy.c
> index 4ef7c6e32d10..ed8f690f6bac 100644
> --- a/net/ethtool/phy.c
> +++ b/net/ethtool/phy.c
> @@ -251,8 +251,6 @@ static int ethnl_phy_dump_one_dev(struct sk_buff *skb, struct net_device *dev,
>   	int ret = 0;
>   	void *ehdr;
>   
> -	pri->base.dev = dev;
> -
>   	if (!dev->link_topo)
>   		return 0;
>   

I've checked that this is leftover from the previous series.

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>