linux-kernel - [PATCH 3.4 143/176] gpio: sysfs: fix memory leak in gpiod_export

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Date:	Thu,  9 Apr 2015 16:46:31 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 143/176] gpio: sysfs: fix memory leak in gpiod_export_link

From: Johan Hovold <johan@...nel.org>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 0f303db08df0df9bd0966443ad6001e63960af16 upstream.

Fix memory leak in the gpio sysfs interface due to failure to drop
reference to device returned by class_find_device when creating a link.

Fixes: a4177ee7f1a8 ("gpiolib: allow exported GPIO nodes to be named
using sysfs links")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[lizf: Backported to 3.4: adjust filename]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/gpio/gpiolib.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6c4443b..011d134 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -825,6 +825,7 @@ int gpio_export_link(struct device *dev, const char *name, unsigned gpio)
 		if (tdev != NULL) {
 			status = sysfs_create_link(&dev->kobj, &tdev->kobj,
 						name);
+			put_device(tdev);
 		} else {
 			status = -ENODEV;
 		}
-- 
1.9.1

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