[PATCH 1/2] gpio: sim: dispose of irq mappings before destroying the irq_sim domain

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.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.

Fixes: cb8c474e79be ("gpio: sim: new testing module")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/gpio/gpio-sim.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
index f1f6f1c32987..27515384aa10 100644
--- a/drivers/gpio/gpio-sim.c
+++ b/drivers/gpio/gpio-sim.c
@@ -291,6 +291,18 @@ 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, irq;
+
+	for (i = 0; i < chip->gc.ngpio; i++) {
+		irq = irq_find_mapping(chip->irq_sim, i);
+		if (irq)
+			irq_dispose_mapping(irq);
+	}
+}
+
 static void gpio_sim_sysfs_remove(void *data)
 {
 	struct gpio_sim_chip *chip = data;
@@ -406,6 +418,10 @@ 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