team: move add to port list before port enablement

team_port_enable() adds port to port_hashlist. Reader sees port
in team_get_port_by_index_rcu() and returns it, but
team_get_first_port_txable_rcu() tries to go through port_list, where the
port is not inserted yet -> NULL pointer dereference.
Fix this by reordering port_list and port_hashlist insertion.
Panic is easily triggeable when txing packets and adding/removing port
in a loop.

Introduced by commit 3d249d4c "net: introduce ethernet teaming device"

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index d016a76ad44b40add050d83a7ba7335c304a63c1..b3051052f3ad5ee1bcd4c53a5c3bdf5370c057f2 100644 (file)
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1092,8 +1092,8 @@ static int team_port_add(struct team *team, struct net_device *port_dev)
        }
 
        port->index = -1;
-       team_port_enable(team, port);
        list_add_tail_rcu(&port->list, &team->port_list);
+       team_port_enable(team, port);
        __team_compute_features(team);
        __team_port_change_port_added(port, !!netif_carrier_ok(port_dev));
        __team_options_change_check(team);