linux-kernel - [PATCH] gpiolib: Fix use after free in gpiochip_add_pin

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Date:	Wed, 21 Nov 2012 14:33:56 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] gpiolib: Fix use after free in gpiochip_add_pin_range

This is introduced by commit 9ab6e988
"gpiolib: return any error code from range creation".

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
This patch is against LinusW's linux-pinctrl tree, for-next branch.
Axel
 drivers/gpio/gpiolib.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 317ff04..8370214 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1201,6 +1201,7 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
 			   unsigned int npins)
 {
 	struct gpio_pin_range *pin_range;
+	int ret;
 
 	pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
 	if (!pin_range) {
@@ -1219,10 +1220,11 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
 	pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
 			&pin_range->range);
 	if (IS_ERR(pin_range->pctldev)) {
+		ret = PTR_ERR(pin_range->pctldev);
 		pr_err("%s: GPIO chip: could not create pin range\n",
 		       chip->label);
 		kfree(pin_range);
-		return PTR_ERR(pin_range->pctldev);
+		return ret;
 	}
 	pr_debug("%s: GPIO chip: created GPIO range %d->%d ==> PIN %d->%d\n",
 		 chip->label, offset, offset + npins - 1,
-- 
1.7.9.5



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