rapidio: rio: fix possible name leak in rio_register_mport()

[ Upstream commit e92a216d16bde65d21a3227e0fb2aa0794576525 ]

If device_register() returns error, the name allocated by dev_set_name()
need be freed.  It should use put_device() to give up the reference in the
error path, so that the name can be freed in kobject_cleanup(), and
list_del() is called to delete the port from rio_mports.

Link: https://lkml.kernel.org/r/20221114152636.2939035-3-yangyingliang@huawei.com
Fixes: 2aaf308b95b2 ("rapidio: rework device hierarchy and introduce mport class of devices")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index e74cf09..9544b8e 100644 (file)
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -2186,11 +2186,16 @@ int rio_register_mport(struct rio_mport *port)
        atomic_set(&port->state, RIO_DEVICE_RUNNING);
 
        res = device_register(&port->dev);
-       if (res)
+       if (res) {
                dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
                        port->id, res);
-       else
+               mutex_lock(&rio_mport_list_lock);
+               list_del(&port->node);
+               mutex_unlock(&rio_mport_list_lock);
+               put_device(&port->dev);
+       } else {
                dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);
+       }
 
        return res;
 }