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authorEelco Chaudron <echaudro@redhat.com>2020-07-24 11:20:59 +0300
committerDavid S. Miller <davem@davemloft.net>2020-07-25 02:58:38 +0300
commita65878d6f00bb2d791348ae90dcc2ede1dbe2b91 (patch)
treee0a6f2c668074161bcb86722a03fec039397c3c2
parentdfd3d5266dc1d9a2b06e5a09bbff4cee547eeb5f (diff)
downloadlinux-a65878d6f00bb2d791348ae90dcc2ede1dbe2b91.tar.xz
net: openvswitch: fixes potential deadlock in dp cleanup code
The previous patch introduced a deadlock, this patch fixes it by making sure the work is canceled without holding the global ovs lock. This is done by moving the reorder processing one layer up to the netns level. Fixes: eac87c413bf9 ("net: openvswitch: reorder masks array based on usage") Reported-by: syzbot+2c4ff3614695f75ce26c@syzkaller.appspotmail.com Reported-by: syzbot+bad6507e5db05017b008@syzkaller.appspotmail.com Reviewed-by: Paolo <pabeni@redhat.com> Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/openvswitch/datapath.c23
-rw-r--r--net/openvswitch/datapath.h4
2 files changed, 13 insertions, 14 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 95805f0e27bd..6b6822f82f70 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1655,7 +1655,6 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
goto err_destroy_reply;
ovs_dp_set_net(dp, sock_net(skb->sk));
- INIT_DELAYED_WORK(&dp->masks_rebalance, ovs_dp_masks_rebalance);
/* Allocate table. */
err = ovs_flow_tbl_init(&dp->table);
@@ -1715,9 +1714,6 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
- schedule_delayed_work(&dp->masks_rebalance,
- msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
-
ovs_unlock();
ovs_notify(&dp_datapath_genl_family, reply, info);
@@ -1762,9 +1758,6 @@ static void __dp_destroy(struct datapath *dp)
/* RCU destroy the flow table */
call_rcu(&dp->rcu, destroy_dp_rcu);
-
- /* Cancel remaining work. */
- cancel_delayed_work_sync(&dp->masks_rebalance);
}
static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
@@ -2349,14 +2342,18 @@ out:
static void ovs_dp_masks_rebalance(struct work_struct *work)
{
- struct datapath *dp = container_of(work, struct datapath,
- masks_rebalance.work);
+ struct ovs_net *ovs_net = container_of(work, struct ovs_net,
+ masks_rebalance.work);
+ struct datapath *dp;
ovs_lock();
- ovs_flow_masks_rebalance(&dp->table);
+
+ list_for_each_entry(dp, &ovs_net->dps, list_node)
+ ovs_flow_masks_rebalance(&dp->table);
+
ovs_unlock();
- schedule_delayed_work(&dp->masks_rebalance,
+ schedule_delayed_work(&ovs_net->masks_rebalance,
msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
}
@@ -2454,6 +2451,9 @@ static int __net_init ovs_init_net(struct net *net)
INIT_LIST_HEAD(&ovs_net->dps);
INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
+ INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
+ schedule_delayed_work(&ovs_net->masks_rebalance,
+ msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
return ovs_ct_init(net);
}
@@ -2508,6 +2508,7 @@ static void __net_exit ovs_exit_net(struct net *dnet)
ovs_unlock();
+ cancel_delayed_work_sync(&ovs_net->masks_rebalance);
cancel_work_sync(&ovs_net->dp_notify_work);
}
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 697a2354194b..24fcec22fde2 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -84,9 +84,6 @@ struct datapath {
/* Switch meters. */
struct dp_meter_table meter_tbl;
-
- /* re-balance flow masks timer */
- struct delayed_work masks_rebalance;
};
/**
@@ -135,6 +132,7 @@ struct dp_upcall_info {
struct ovs_net {
struct list_head dps;
struct work_struct dp_notify_work;
+ struct delayed_work masks_rebalance;
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
struct ovs_ct_limit_info *ct_limit_info;
#endif