User space pointer may not be dereferenced. Use get_user()/put_user()
instead and check their return codes.
Signed-off-by: NVasiliy Kulikov <segooon@gmail.com>
Signed-off-by: NThomas Renninger <trenn@suse.de>
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>