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

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6dd7df80ae20610799808a0df10f399d9fb843b1..ca1cb2d756c29c36ae17cb2ca3091004c3b32666 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -928,7 +928,7 @@ static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
        }
 
        status = sysfs_set_active_low(desc, dev, value);
-
+       put_device(dev);
 unlock:
        mutex_unlock(&sysfs_lock);