netdev - [PATCH] net: hso: do not unregister if not registered

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Date:   Sat, 9 Feb 2019 16:24:20 +0000
From:   "Yavuz, Tuba" <tuba@....ufl.edu>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH] net: hso: do not unregister if not registered

On an error path inside the hso_create_net_device function of the hso
driver, hso_free_net_device gets called. This causes potentially a
negative reference count in the net device if register_netdev has not
been called yet as hso_free_net_device calls unregister_netdev
regardless. I think the driver should distinguish these cases and call
unregister_netdev only if register_netdev has been called.

Signed-off-by: Tuba Yavuz <tuba@....ufl.edu>
---

--- linux-stable/drivers/net/usb/hso.c.orig	2019-01-27 14:45:58.232683119 -0500
+++ linux-stable/drivers/net/usb/hso.c	2019-02-05 17:54:17.056496019 -0500
@@ -2377,7 +2377,9 @@ static void hso_free_net_device(struct h

 	remove_net_device(hso_net->parent);

-	if (hso_net->net)
+	if (hso_net->net &&
+	    hso_net->net->reg_state == NETREG_REGISTERED)
 		unregister_netdev(hso_net->net);

 	/* start freeing */