linux-kernel - Re: [PATCH] Fix race condition about network device name allocation

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Message-ID: <20070613155335.47111c67@localhost>
Date:	Wed, 13 Jun 2007 15:53:35 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Dan Aloni <da-x@...atomic.org>,
	Chad Tindel <ctindel@...rs.sourceforge.net>,
	Jay Vosburgh <fubar@...ibm.com>
Cc:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bonding-devel@...ts.sourceforge.net
Subject: Re: [PATCH] Fix race condition about network device name allocation

Bonding refers to device after unregistering. This has always been
a dangerous thing. The following UNTESTED should fix the problem.

--- a/drivers/net/bonding/bond_sysfs.c	2007-06-13 15:48:37.000000000 -0700
+++ b/drivers/net/bonding/bond_sysfs.c	2007-06-13 15:49:17.000000000 -0700
@@ -164,9 +164,10 @@ static ssize_t bonding_store_bonds(struc
 				printk(KERN_INFO DRV_NAME
 					": %s is being deleted...\n",
 					bond->dev->name);
-				unregister_netdevice(bond->dev);
+
 				bond_deinit(bond->dev);
 		        	bond_destroy_sysfs_entry(bond);
+				unregister_netdevice(bond->dev);
 				rtnl_unlock();
 				goto out;
 			}
-
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