netdev - Re: [PATCH net v2] net: vlan: fix a UAF in vlan_dev_real

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Message-ID: <8735nstq62.fsf@nvidia.com>
Date:   Fri, 19 Nov 2021 11:07:01 +0100
From:   Petr Machata <petrm@...dia.com>
To:     "Ziyang Xuan (William)" <william.xuanziyang@...wei.com>
CC:     Jakub Kicinski <kuba@...nel.org>, Petr Machata <petrm@...dia.com>,
        <davem@...emloft.net>, <jgg@...dia.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v2] net: vlan: fix a UAF in vlan_dev_real_dev()


Ziyang Xuan (William) <william.xuanziyang@...wei.com> writes:

> I need some time to test my some ideas. And anyone has good ideas, please
> do not be stingy.

Jakub Kicinski <kuba@...nel.org> writes:

> I think we should move the dev_hold() to ndo_init(), otherwise it's
> hard to reason if destructor was invoked or not if
> register_netdevice() errors out.

That makes sense to me. We always put real_dev in the destructor, so we
should always hold it in the constructor...