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openvswitch: Fix net exit.

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Open vSwitch allows moving internal vport to different namespace
while still connected to the bridge. But when namespace deleted
OVS does not detach these vports, that results in dangling
pointer to netdevice which causes kernel panic as follows.
This issue is fixed by detaching all ovs ports from the deleted
namespace at net-exit.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
IP: [<ffffffffa0aadaa5>] ovs_vport_locate+0x35/0x80 [openvswitch]
Oops: 0000 [#1] SMP
Call Trace:
 [<ffffffffa0aa6391>] lookup_vport+0x21/0xd0 [openvswitch]
 [<ffffffffa0aa65f9>] ovs_vport_cmd_get+0x59/0xf0 [openvswitch]
 [<ffffffff8167e07c>] genl_family_rcv_msg+0x1bc/0x3e0
 [<ffffffff8167e319>] genl_rcv_msg+0x79/0xc0
 [<ffffffff8167d919>] netlink_rcv_skb+0xb9/0xe0
 [<ffffffff8167deac>] genl_rcv+0x2c/0x40
 [<ffffffff8167cffd>] netlink_unicast+0x12d/0x1c0
 [<ffffffff8167d3da>] netlink_sendmsg+0x34a/0x6b0
 [<ffffffff8162e140>] sock_sendmsg+0xa0/0xe0
 [<ffffffff8162e5e8>] ___sys_sendmsg+0x408/0x420
 [<ffffffff8162f541>] __sys_sendmsg+0x51/0x90
 [<ffffffff8162f592>] SyS_sendmsg+0x12/0x20
 [<ffffffff81764ee9>] system_call_fastpath+0x12/0x17

Reported-by: Assaf Muller <amuller@redhat.com>
Fixes: 46df7b81454("openvswitch: Add support for network namespaces.")
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Reviewed-by: Thomas Graf <tgraf@noironetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2015-02-17 11:23:10 -08:00 • committed by David S. Miller
parent 34eea79e26
commit 7b4577a9da
2 changed files with 45 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

45
net/openvswitch/datapath.c
View file

@ -2194,14 +2194,55 @@ static int __net_init ovs_init_net(struct net *net)
return 0;
}
static void __net_exit ovs_exit_net(struct net *net)
static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
struct list_head *head)
{
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
struct datapath *dp;
list_for_each_entry(dp, &ovs_net->dps, list_node) {
int i;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
struct vport *vport;
hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
struct netdev_vport *netdev_vport;
if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
continue;
netdev_vport = netdev_vport_priv(vport);
if (dev_net(netdev_vport->dev) == dnet)
list_add(&vport->detach_list, head);
}
}
}
}
static void __net_exit ovs_exit_net(struct net *dnet)
{
struct datapath *dp, *dp_next;
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
struct vport *vport, *vport_next;
struct net *net;
LIST_HEAD(head);
ovs_lock();
list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
__dp_destroy(dp);
rtnl_lock();
for_each_net(net)
list_vports_from_net(net, dnet, &head);
rtnl_unlock();
/* Detach all vports from given namespace. */
list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
list_del(&vport->detach_list);
ovs_dp_detach_port(vport);
}
ovs_unlock();
cancel_work_sync(&ovs_net->dp_notify_work);