This is a note to let you know that I've just added the patch titled
team: fix possible null pointer dereference in team_handle_frame
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
team-fix-possible-null-pointer-dereference-in-team_handle_frame.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Mar 11 11:44:33 CET 2015
From: Jiri Pirko <jiri@xxxxxxxxxxx>
Date: Mon, 23 Feb 2015 14:02:54 +0100
Subject: team: fix possible null pointer dereference in team_handle_frame
From: Jiri Pirko <jiri@xxxxxxxxxxx>
[ Upstream commit 57e595631904c827cfa1a0f7bbd7cc9a49da5745 ]
Currently following race is possible in team:
CPU0 CPU1
team_port_del
team_upper_dev_unlink
priv_flags &= ~IFF_TEAM_PORT
team_handle_frame
team_port_get_rcu
team_port_exists
priv_flags & IFF_TEAM_PORT == 0
return NULL (instead of port got
from rx_handler_data)
netdev_rx_handler_unregister
The thing is that the flag is removed before rx_handler is unregistered.
If team_handle_frame is called in between, team_port_exists returns 0
and team_port_get_rcu will return NULL.
So do not check the flag here. It is guaranteed by netdev_rx_handler_unregister
that team_handle_frame will always see valid rx_handler_data pointer.
Signed-off-by: Jiri Pirko <jiri@xxxxxxxxxxx>
Fixes: 3d249d4ca7d0 ("net: introduce ethernet teaming device")
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/team/team.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -42,9 +42,7 @@
static struct team_port *team_port_get_rcu(const struct net_device *dev)
{
- struct team_port *port = rcu_dereference(dev->rx_handler_data);
-
- return team_port_exists(dev) ? port : NULL;
+ return rcu_dereference(dev->rx_handler_data);
}
static struct team_port *team_port_get_rtnl(const struct net_device *dev)
Patches currently in stable-queue which might be from jiri@xxxxxxxxxxx are
queue-3.19/team-don-t-traverse-port-list-using-rcu-in-team_set_mac_address.patch
queue-3.19/ipv6-addrconf-add-missing-validate_link_af-handler.patch
queue-3.19/team-fix-possible-null-pointer-dereference-in-team_handle_frame.patch
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