netdev - Re: [PATCH 11/20] ethernet: ucc_geth: fix use-after-free in ucc_geth

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Message-ID: <20201205124859.60d045e6@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com>
Date:   Sat, 5 Dec 2020 12:48:59 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     Li Yang <leoyang.li@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Zhao Qiang <qiang.zhao@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/20] ethernet: ucc_geth: fix use-after-free in
 ucc_geth_remove()

On Sat,  5 Dec 2020 20:17:34 +0100 Rasmus Villemoes wrote:
> -	unregister_netdev(dev);
> -	free_netdev(dev);
>  	ucc_geth_memclean(ugeth);
>  	if (of_phy_is_fixed_link(np))
>  		of_phy_deregister_fixed_link(np);
>  	of_node_put(ugeth->ug_info->tbi_node);
>  	of_node_put(ugeth->ug_info->phy_node);
> +	unregister_netdev(dev);
> +	free_netdev(dev);

Are you sure you want to move the unregister_netdev() as well as the
free?