netdev - Re: [BUG] net: macb: Use-After-Free when removing the module

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Date:   Thu, 3 Mar 2022 07:57:38 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Zheyu Ma <zheyuma97@...il.com>
Cc:     nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com,
        netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] net: macb: Use-After-Free when removing the module

On Thu, 3 Mar 2022 20:24:53 +0800 Zheyu Ma wrote:
> When removing the macb_pci module, the driver will cause a UAF bug.
> 
> Commit d82d5303c4c5 ("net: macb: fix use after free on rmmod") moves
> the platform_device_unregister() after clk_unregister(), but this
> introduces another UAF bug.

The layering is all weird here. macb_probe() should allocate a private
structure for the _PCI driver_ which it can then attach to 
struct pci_dev *pdev as driver data. Then free it in remove.
It shouldn't stuff its information into the platform device.

Are you willing to send a fix like that?