linux-kernel - Re: [PATCH] PCI/pwrctrl: Cancel outstanding rescan work when unregistering

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Message-ID: <CAMRc=Mc67rALxbFu3KJBT7k0oMwjLchyackknXbgRD04v1Xaqw@mail.gmail.com>
Date: Wed, 23 Apr 2025 20:35:57 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Brian Norris <briannorris@...omium.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org, 
	linux-pci@...r.kernel.org, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Brian Norris <briannorris@...gle.com>, 
	Konrad Dybcio <konradybcio@...nel.org>, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] PCI/pwrctrl: Cancel outstanding rescan work when unregistering

On Wed, Apr 9, 2025 at 8:54 PM Brian Norris <briannorris@...omium.org> wrote:
>
> From: Brian Norris <briannorris@...gle.com>
>
> It's possible to trigger use-after-free here by:
> (a) forcing rescan_work_func() to take a long time and
> (b) utilizing a pwrctrl driver that may be unloaded for some reason.
>
> I'm unlucky to trigger both of these in development. It's likely much
> more difficult to hit this in practice.
>
> Anyway, we should ensure our work is finished before we allow our data
> structures to be cleaned up.
>
> Fixes: 8f62819aaace ("PCI/pwrctl: Rescan bus on a separate thread")
> Cc: Konrad Dybcio <konradybcio@...nel.org>
> Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> Signed-off-by: Brian Norris <briannorris@...gle.com>
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
>

Sorry, it fell off my radar.

Acked-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>