rapidio: fix possible name leaks when rio_add_device() fails

[ Upstream commit f9574cd486 ]

Patch series "rapidio: fix three possible memory leaks".

This patchset fixes three name leaks in error handling.
 - patch #1 fixes two name leaks while rio_add_device() fails.
 - patch #2 fixes a name leak while  rio_register_mport() fails.

This patch (of 2):

If rio_add_device() 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 the
'rdev' can be freed in rio_release_dev().

Link: https://lkml.kernel.org/r/20221114152636.2939035-1-yangyingliang@huawei.com
Link: https://lkml.kernel.org/r/20221114152636.2939035-2-yangyingliang@huawei.com
Fixes: e8de370188 ("rapidio: add mport char device driver")
Fixes: 1fa5ae857b ("driver core: get rid of struct device's bus_id string array")
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>

drivers/rapidio/devices/rio_mport_cdev.c

@@ -1803,8 +1803,11 @@ static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
 		rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 				   0, 0xffff);
 	err = rio_add_device(rdev);
-	if (err)
-		goto cleanup;
+	if (err) {
+		put_device(&rdev->dev);
+		return err;
+	}
+
 	rio_dev_get(rdev);
 
 	return 0;

drivers/rapidio/rio-scan.c

@@ -454,8 +454,12 @@ static struct rio_dev *rio_setup_device(struct rio_net *net,
 				   0, 0xffff);
 
 	ret = rio_add_device(rdev);
-	if (ret)
-		goto cleanup;
+	if (ret) {
+		if (rswitch)
+			kfree(rswitch->route_table);
+		put_device(&rdev->dev);
+		return NULL;
+	}
 
 	rio_dev_get(rdev);