linux-kernel - Re: arm64: libgpiod: refcount_t: underflow; use-after-free.

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Date:   Tue, 21 Feb 2023 19:54:31 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, Bartosz Golaszewski <brgl@...ev.pl>,
        Ferry Toth <fntoth@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>, warthog618@...il.com,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: arm64: libgpiod: refcount_t: underflow; use-after-free.

On Tue, Feb 21, 2023 at 07:13:31PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 20, 2023 at 08:29:27PM +0530, Naresh Kamboju wrote:
> > Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> > running Linux version v6.2.0 while running libgpiod tests.

...

> -		ACPI_COMPANION_SET(&pdev->dev, NULL);

This line should stay otherwise it will remove the device that may share
the fwnode with this newly created platform device.

-- 
With Best Regards,
Andy Shevchenko