linux-kernel - [PATCH] gpio: fix resource unwinding order in error path

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Date: Thu, 29 Feb 2024 18:25:49 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>,
	Johan Hovold <johan@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] gpio: fix resource unwinding order in error path

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Hogs are added *after* ACPI so should be removed *before* in error path.

Fixes: 6d86750ce623 ("gpio: fix gpio leak in gpiochip_add error path")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 21edc5eafa68..7fd9c59e73c5 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1025,11 +1025,11 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 
 	ret = gpiochip_irqchip_init_valid_mask(gc);
 	if (ret)
-		goto err_remove_acpi_chip;
+		goto err_free_hogs;
 
 	ret = gpiochip_irqchip_init_hw(gc);
 	if (ret)
-		goto err_remove_acpi_chip;
+		goto err_remove_irqchip_mask;
 
 	ret = gpiochip_add_irqchip(gc, lock_key, request_key);
 	if (ret)
@@ -1054,11 +1054,11 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	gpiochip_irqchip_remove(gc);
 err_remove_irqchip_mask:
 	gpiochip_irqchip_free_valid_mask(gc);
-err_remove_acpi_chip:
+err_free_hogs:
+	gpiochip_free_hogs(gc);
 	acpi_gpiochip_remove(gc);
 	gpiochip_remove_pin_ranges(gc);
 err_remove_of_chip:
-	gpiochip_free_hogs(gc);
 	of_gpiochip_remove(gc);
 err_cleanup_desc_srcu:
 	for (i = 0; i < gdev->ngpio; i++)
-- 
2.40.1