linux-kernel - Re: [PATCH 1/2] gpio: sim: dispose of irq mappings before destroying the irq

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Message-ID: <ZOSmFGZHrLq3I+zF@smile.fi.intel.com>
Date:   Tue, 22 Aug 2023 15:12:04 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 1/2] gpio: sim: dispose of irq mappings before destroying
 the irq_sim domain

On Tue, Aug 22, 2023 at 09:51:21AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> If a GPIO simulator device is unbound with interrupts still requested,
> we will hit a use-after-free issue in __irq_domain_deactivate_irq(). The
> owner of the irq domain must dispose of all mappings before destroying
> the domain object.

...

> +static void gpio_sim_dispose_mappings(void *data)
> +{
> +	struct gpio_sim_chip *chip = data;
> +	unsigned int i, irq;
> +
> +	for (i = 0; i < chip->gc.ngpio; i++) {
> +		irq = irq_find_mapping(chip->irq_sim, i);

> +		if (irq)

This duplicates check in the following call.

> +			irq_dispose_mapping(irq);
> +	}
> +}

-- 
With Best Regards,
Andy Shevchenko