net/ncsi: Disable the ncsi work before freeing the associated structure

The work function can run after the ncsi device is freed, resulting
in use-after-free bugs or kernel panic.

Fixes: 2d283bd ("net/ncsi: Resource management")
Signed-off-by: Eddie James <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: Eddie James

net/ncsi/ncsi-manage.c

@@ -1954,6 +1954,8 @@ void ncsi_unregister_dev(struct ncsi_dev *nd)
 	list_del_rcu(&ndp->node);
 	spin_unlock_irqrestore(&ncsi_dev_lock, flags);
 
+	disable_work_sync(&ndp->work);
+
 	kfree(ndp);
 }
 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);