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authorJiri Pirko <jiri@resnulli.us>2013-06-08 15:00:54 +0200
committerDavid S. Miller <davem@davemloft.net>2013-06-12 00:56:27 -0700
commit72df935d985c1575ed44ad2c8c653b28147993fa (patch)
treef542a207e79b8d9fda9edf98f384d49ca87db126 /drivers/net/team
parent76c455decbbad31de21c727edb184a963f42b40b (diff)
downloadlinux-72df935d985c1575ed44ad2c8c653b28147993fa.tar.bz2
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>
Diffstat (limited to 'drivers/net/team')
-rw-r--r--drivers/net/team/team.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index d016a76ad44b..b3051052f3ad 100644
--- 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);