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Message-ID: <ZOYFjtt/+9hPw4u0@smile.fi.intel.com>
Date: Wed, 23 Aug 2023 16:11:42 +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 v2 1/2] gpio: sim: dispose of irq mappings before
destroying the irq_sim domain
On Tue, Aug 22, 2023 at 09:29:42PM +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.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Fixes: cb8c474e79be ("gpio: sim: new testing module")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
> v1 -> v2:
> - drop the return value check of irq_find_mapping()
>
> drivers/gpio/gpio-sim.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
> index f1f6f1c32987..8fb11a5395eb 100644
> --- a/drivers/gpio/gpio-sim.c
> +++ b/drivers/gpio/gpio-sim.c
> @@ -291,6 +291,15 @@ static void gpio_sim_mutex_destroy(void *data)
> mutex_destroy(lock);
> }
>
> +static void gpio_sim_dispose_mappings(void *data)
> +{
> + struct gpio_sim_chip *chip = data;
> + unsigned int i;
> +
> + for (i = 0; i < chip->gc.ngpio; i++)
> + irq_dispose_mapping(irq_find_mapping(chip->irq_sim, i));
> +}
> +
> static void gpio_sim_sysfs_remove(void *data)
> {
> struct gpio_sim_chip *chip = data;
> @@ -406,6 +415,10 @@ static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev)
> if (IS_ERR(chip->irq_sim))
> return PTR_ERR(chip->irq_sim);
>
> + ret = devm_add_action_or_reset(dev, gpio_sim_dispose_mappings, chip);
> + if (ret)
> + return ret;
> +
> mutex_init(&chip->lock);
> ret = devm_add_action_or_reset(dev, gpio_sim_mutex_destroy,
> &chip->lock);
> --
> 2.39.2
>
--
With Best Regards,
Andy Shevchenko
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