linux-kernel - [PATCH 3.18 01/39] gpio: sysfs: fix memory leak in gpiod_export

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Message-Id: <20150209083328.849998198@linuxfoundation.org>
Date:	Mon,  9 Feb 2015 16:33:44 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 3.18 01/39] gpio: sysfs: fix memory leak in gpiod_export_link

3.18-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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpiolib-sysfs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -630,6 +630,7 @@ int gpiod_export_link(struct device *dev
 		if (tdev != NULL) {
 			status = sysfs_create_link(&dev->kobj, &tdev->kobj,
 						name);
+			put_device(tdev);
 		} else {
 			status = -ENODEV;
 		}


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