From: Johan Hovold <johan@kernel.org>
Date: Mon, 26 Jan 2015 11:02:46 +0000 (+0100)
Subject: gpio: sysfs: fix memory leak in gpiod_sysfs_set_active_low
X-Git-Tag: v3.4.107~34
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e835e9f16acd0fd6ace354b62715c05979c96bf;p=thirdparty%2Fkernel%2Fstable.git

gpio: sysfs: fix memory leak in gpiod_sysfs_set_active_low

commit 49d2ca84e433dab854c7a866bc6add09cfab682d upstream.

Fix memory leak in the gpio sysfs interface due to failure to drop
reference to device returned by class_find_device when setting the
gpio-line polarity.

Fixes: 0769746183ca ("gpiolib: add support for changing value polarity
in sysfs")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
[lizf: Backported to 3.4: adjust filename]
Signed-off-by: Zefan Li <lizefan@huawei.com>
---

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 011d134025255..7cb3cb94c672d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -876,7 +876,7 @@ int gpio_sysfs_set_active_low(unsigned gpio, int value)
 	}
 
 	status = sysfs_set_active_low(desc, dev, value);
-
+	put_device(dev);
 unlock:
 	mutex_unlock(&sysfs_lock);