linux-kernel - [PATCH 3.4 144/176] gpio: sysfs: fix memory leak in gpiod_sysfs_set_active

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Message-Id: <1428569224-23820-144-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:46:32 +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 3.4 144/176] gpio: sysfs: fix memory leak in gpiod_sysfs_set_active_low

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

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

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


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@...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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 011d134..7cb3cb9 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);
 
-- 
1.9.1

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