netdev - [PATCH net-next] net: openvswitch: fixes crash if nf_conncount

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Date:   Mon, 31 Aug 2020 11:57:57 +0200
From:   Eelco Chaudron <echaudro@...hat.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, dev@...nvswitch.org, kuba@...nel.org,
        pabeni@...hat.com, pshelar@....org
Subject: [PATCH net-next] net: openvswitch: fixes crash if nf_conncount_init() fails

If nf_conncount_init fails currently the dispatched work is not canceled,
causing problems when the timer fires. This change fixes this by not
scheduling the work until all initialization is successful.

Fixes: a65878d6f00b ("net: openvswitch: fixes potential deadlock in dp cleanup code")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Eelco Chaudron <echaudro@...hat.com>
---
 net/openvswitch/datapath.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 6e47ef7ef036..78941822119f 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -2476,13 +2476,19 @@ static int __init dp_register_genl(void)
 static int __net_init ovs_init_net(struct net *net)
 {
 	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+	int err;
 
 	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);
+
+	err = ovs_ct_init(net);
+	if (err)
+		return err;
+
 	schedule_delayed_work(&ovs_net->masks_rebalance,
 			      msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
-	return ovs_ct_init(net);
+	return 0;
 }
 
 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,