linux-kernel - [47/49] bonding: fix error handling if slave is busy (v2)

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Message-Id: <20120110215605.644114899@clark.kroah.org>
Date:	Tue, 10 Jan 2012 13:55:50 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [47/49] bonding: fix error handling if slave is busy (v2)

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: stephen hemminger <shemminger@...tta.com>

commit f7d9821a6a9c83450ac35e76d3709e32fd38b76f upstream.

If slave device already has a receive handler registered, then the
error unwind of bonding device enslave function is broken.

The following will leave a pointer to freed memory in the slave
device list, causing a later kernel panic.
# modprobe dummy
# ip li add dummy0-1 link dummy0 type macvlan
# modprobe bonding
# echo +dummy0 >/sys/class/net/bond0/bonding/slaves

The fix is to detach the slave (which removes it from the list)
in the unwind path.

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
Reviewed-by: Nicolas de Pesloüan <nicolas.2p.debian@...e.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/bonding/bond_main.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1822,7 +1822,7 @@ int bond_enslave(struct net_device *bond
 				 "but new slave device does not support netpoll.\n",
 				 bond_dev->name);
 			res = -EBUSY;
-			goto err_close;
+			goto err_detach;
 		}
 	}
 #endif
@@ -1831,7 +1831,7 @@ int bond_enslave(struct net_device *bond
 
 	res = bond_create_slave_symlinks(bond_dev, slave_dev);
 	if (res)
-		goto err_close;
+		goto err_detach;
 
 	res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
 					 new_slave);
@@ -1852,6 +1852,11 @@ int bond_enslave(struct net_device *bond
 err_dest_symlinks:
 	bond_destroy_slave_symlinks(bond_dev, slave_dev);
 
+err_detach:
+	write_lock_bh(&bond->lock);
+	bond_detach_slave(bond, new_slave);
+	write_unlock_bh(&bond->lock);
+
 err_close:
 	dev_close(slave_dev);
 


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