gpio: sysfs: fix memory leak in gpiod_export_link

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")
Cc: stable <[email protected]>	# v2.6.32
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index f62aa115d79ab4f9fe7e249dbb146dfdde44153e..4667830f350e77e55e7d15bef38aaf0db27f63bd 100644 (file)
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -648,6 +648,7 @@ 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;
                }