This is a note to let you know that I've just added the patch titled
bonding: fix bonding_masters race condition in bond unloading
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bonding-fix-bonding_masters-race-condition-in-bond-unloading.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1d0ca04f861a39a45e1dd3e5533aa88a0aff4d8d Mon Sep 17 00:00:00 2001
From: "nikolay@xxxxxxxxxx" <nikolay@xxxxxxxxxx>
Date: Sat, 6 Apr 2013 00:54:38 +0000
Subject: bonding: fix bonding_masters race condition in bond unloading
From: "nikolay@xxxxxxxxxx" <nikolay@xxxxxxxxxx>
[ Upstream commit 69b0216ac255f523556fa3d4ff030d857eaaa37f ]
While the bonding module is unloading, it is considered that after
rtnl_link_unregister all bond devices are destroyed but since no
synchronization mechanism exists, a new bond device can be created
via bonding_masters before unregister_pernet_subsys which would
lead to multiple problems (e.g. NULL pointer dereference, wrong RIP,
list corruption).
This patch fixes the issue by removing any bond devices left in the
netns after bonding_masters is removed from sysfs.
Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxx>
Acked-by: Veaceslav Falico <vfalico@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/bonding/bond_main.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4864,9 +4864,18 @@ static int __net_init bond_net_init(stru
static void __net_exit bond_net_exit(struct net *net)
{
struct bond_net *bn = net_generic(net, bond_net_id);
+ struct bonding *bond, *tmp_bond;
+ LIST_HEAD(list);
bond_destroy_sysfs(bn);
bond_destroy_proc_dir(bn);
+
+ /* Kill off any bonds created after unregistering bond rtnl ops */
+ rtnl_lock();
+ list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
+ unregister_netdevice_queue(bond->dev, &list);
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
}
static struct pernet_operations bond_net_ops = {
Patches currently in stable-queue which might be from nikolay@xxxxxxxxxx are
queue-3.4/bonding-iff_bonding-is-not-stripped-on-enslave-failure.patch
queue-3.4/bonding-fix-bonding_masters-race-condition-in-bond-unloading.patch
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