linux-kernel - [PATCH 3.13.y-ckt 69/80] gpio: sysfs: fix memory leak in gpiod_export

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Message-Id: <1426804568-2907-70-git-send-email-kamal@canonical.com>
Date:	Thu, 19 Mar 2015 15:35:57 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Johan Hovold <johan@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 69/80] gpio: sysfs: fix memory leak in gpiod_export_link

3.13.11-ckt17 -stable review patch.  If anyone has any objections, please let me know.

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

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

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>
[ kamal: backport to 3.13-stable: applied to drivers/gpio/gpiolib.c ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpio/gpiolib.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e829dc4..1dda7e6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -893,6 +893,7 @@ int gpiod_export_link(struct device *dev, const char *name,
 		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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