When cdev_device_add() failed, calling put_device() to explicitly release dev->lirc_dev. Otherwise, it could cause the fault of the reference count.
Found by code review.
Cc: stable@vger.kernel.org Fixes: a6ddd4fecbb0 ("media: lirc: remove last remnants of lirc kapi") Signed-off-by: Ma Ke make24@iscas.ac.cn --- Changes in v2: - move get_device() before cdev_device_add() to adjust the timing of parent device reference. --- drivers/media/rc/lirc_dev.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c index a2257dc2f25d..7d4942925993 100644 --- a/drivers/media/rc/lirc_dev.c +++ b/drivers/media/rc/lirc_dev.c @@ -736,11 +736,11 @@ int lirc_register(struct rc_dev *dev)
cdev_init(&dev->lirc_cdev, &lirc_fops);
+ get_device(&dev->dev); + err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev); if (err) - goto out_ida; - - get_device(&dev->dev); + goto out_put_device;
switch (dev->driver_type) { case RC_DRIVER_SCANCODE: @@ -764,7 +764,8 @@ int lirc_register(struct rc_dev *dev)
return 0;
-out_ida: +out_put_device: + put_device(&dev->lirc_dev); ida_free(&lirc_ida, minor); return err; }