3.2.97-rc1 review patch. If anyone has any objections, please let me know.
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From: Guillaume Nault g.nault@alphalink.fr
commit 9f775ead5e570e7e19015b9e4e2f3dd6e71a5935 upstream.
The l2tp_eth module crashes if its netlink callbacks are run when the pernet data aren't initialised.
We should normally register_pernet_device() before the genl callbacks. However, the pernet data only maintain a list of l2tpeth interfaces, and this list is never used. So let's just drop pernet handling instead.
Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support") Signed-off-by: Guillaume Nault g.nault@alphalink.fr Signed-off-by: David S. Miller davem@davemloft.net [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- net/l2tp/l2tp_eth.c | 51 ++------------------------------------------------- 1 file changed, 2 insertions(+), 49 deletions(-)
--- a/net/l2tp/l2tp_eth.c +++ b/net/l2tp/l2tp_eth.c @@ -39,7 +39,6 @@ struct l2tp_eth { struct net_device *dev; struct sock *tunnel_sock; struct l2tp_session *session; - struct list_head list; };
/* via l2tp_session_priv() */ @@ -47,17 +46,6 @@ struct l2tp_eth_sess { struct net_device *dev; };
-/* per-net private data for this module */ -static unsigned int l2tp_eth_net_id; -struct l2tp_eth_net { - struct list_head l2tp_eth_dev_list; - spinlock_t l2tp_eth_lock; -}; - -static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net) -{ - return net_generic(net, l2tp_eth_net_id); -}
static int l2tp_eth_dev_init(struct net_device *dev) { @@ -72,12 +60,6 @@ static int l2tp_eth_dev_init(struct net_
static void l2tp_eth_dev_uninit(struct net_device *dev) { - struct l2tp_eth *priv = netdev_priv(dev); - struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev)); - - spin_lock(&pn->l2tp_eth_lock); - list_del_init(&priv->list); - spin_unlock(&pn->l2tp_eth_lock); dev_put(dev); }
@@ -193,7 +175,6 @@ static int l2tp_eth_create(struct net *n struct l2tp_eth *priv; struct l2tp_eth_sess *spriv; int rc; - struct l2tp_eth_net *pn;
if (cfg->ifname) { dev = dev_get_by_name(net, cfg->ifname); @@ -228,7 +209,6 @@ static int l2tp_eth_create(struct net *n priv = netdev_priv(dev); priv->dev = dev; priv->session = session; - INIT_LIST_HEAD(&priv->list);
priv->tunnel_sock = tunnel->sock; session->recv_skb = l2tp_eth_dev_recv; @@ -249,10 +229,6 @@ static int l2tp_eth_create(struct net *n strlcpy(session->ifname, dev->name, IFNAMSIZ);
dev_hold(dev); - pn = l2tp_eth_pernet(dev_net(dev)); - spin_lock(&pn->l2tp_eth_lock); - list_add(&priv->list, &pn->l2tp_eth_dev_list); - spin_unlock(&pn->l2tp_eth_lock);
return 0;
@@ -265,22 +241,6 @@ out: return rc; }
-static __net_init int l2tp_eth_init_net(struct net *net) -{ - struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id); - - INIT_LIST_HEAD(&pn->l2tp_eth_dev_list); - spin_lock_init(&pn->l2tp_eth_lock); - - return 0; -} - -static struct pernet_operations l2tp_eth_net_ops = { - .init = l2tp_eth_init_net, - .id = &l2tp_eth_net_id, - .size = sizeof(struct l2tp_eth_net), -}; -
static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = { .session_create = l2tp_eth_create, @@ -294,25 +254,18 @@ static int __init l2tp_eth_init(void)
err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops); if (err) - goto out; - - err = register_pernet_device(&l2tp_eth_net_ops); - if (err) - goto out_unreg; + goto err;
printk(KERN_INFO "L2TP ethernet pseudowire support (L2TPv3)\n");
return 0;
-out_unreg: - l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); -out: +err: return err; }
static void __exit l2tp_eth_exit(void) { - unregister_pernet_device(&l2tp_eth_net_ops); l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); }