linux-kernel - Re: [PATCH linux next] net: dsa: fix the dsa

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Message-ID: <41e1f541-ef92-40ad-ab4d-263303479959@web.de>
Date: Fri, 20 Dec 2024 12:10:14 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Peilin He <he.peilin@....com.cn>, Kun Jiang <jiang.kun2@....com.cn>,
 xu xin <xu.xin16@....com.cn>, netdev@...r.kernel.org,
 Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Vladimir Oltean <olteanv@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Fan Yu <fan.yu9@....com.cn>,
 tu.qiang35@....com.cn, yang.yang29@....com.cn,
 Yaxin Wang <wang.yaxin@....com.cn>, ye xingchen <ye.xingchen@....com.cn>,
 Yunkai Zhang <zhang.yunkai@....com.cn>, Yutan Qiu <qiu.yutan@....com.cn>
Subject: Re: [PATCH linux next] net: dsa: fix the dsa_ptr null pointer
 dereference

…
> +++ b/net/dsa/dsa.c
> @@ -1561,6 +1561,17 @@ void dsa_unregister_switch(struct dsa_switch *ds)
>  }
>  EXPORT_SYMBOL_GPL(dsa_unregister_switch);
>
> +static void dsa_conduit_ethtool_shutdown(struct net_device *dev)
> +{
> +	struct dsa_port *cpu_dp = dev->dsa_ptr;

I suggest to assign this local variable only after the subsequent check.

> +
> +	if (netif_is_lag_master(dev))
> +		return;
> +
> +	dev->ethtool_ops = cpu_dp->orig_ethtool_ops;
> +	cpu_dp->orig_ethtool_ops = NULL;
> +}
…

Regards,
Markus