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[3.8.y.z,extended,stable] Patch "team: move add to port list before port enablement" has been added to staging queue

Message ID 1372198814-20272-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa June 25, 2013, 10:20 p.m. UTC 
This is a note to let you know that I have just added a patch titled

    team: move add to port list before port enablement

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.4.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

From 6871d08385f523147fc135dd056df45174052c1a Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jiri@resnulli.us>
Date: Sat, 8 Jun 2013 15:00:54 +0200
Subject: team: move add to port list before port enablement

[ Upstream commit 72df935d985c1575ed44ad2c8c653b28147993fa ]

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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/net/team/team.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
1.8.1.2
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Patch

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 8efe47a..3c181ca 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1076,8 +1076,8 @@  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);