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Date:   Tue, 22 Mar 2022 07:03:59 -0700
From:   Eric Dumazet <>
To:     Ziyang Xuan <>,,,,
Subject: Re: [PATCH net-next v3 1/3] net: ipvlan: fix potential UAF problem
 for phy_dev

On 3/19/22 02:52, Ziyang Xuan wrote:
> There is a known scenario can trigger UAF problem for lower
> netdevice as following:

But this known scenario never happens.

So maybe you should not add it 'in the future'

> Someone module puts the NETDEV_UNREGISTER event handler to a
> work, and lower netdevice is accessed in the work handler. But
> when the work is excuted, lower netdevice has been destroyed
> because upper netdevice did not get reference to lower netdevice
> correctly.

Again, whoever would like to use a work queue would also

need to hold a reference on the device.

Regardless of ipvlan being used or not.

> Although it can not happen for ipvlan now because there is no
> way to access phy_dev outside ipvlan. But it is necessary to
> add the reference operation to phy_dev to avoid the potential
> UAF problem in the future.
> Signed-off-by: Ziyang Xuan <>
> ---

Your patch makes no sense to me really.

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