netdev - [PATCH net] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 18 Jan 2016 17:30:22 +0200
From:	Ido Schimmel <idosch@...lanox.com>
To:	<davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <jiri@...lanox.com>,
	<eladr@...lanox.com>, <yotamg@...lanox.com>,
	<ogerlitz@...lanox.com>, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid

We can't be within an RCU read-side critical section when deleting
VLANs, as underlying drivers might sleep during the hardware operation.
Therefore, replace the RCU critical section with a mutex. This is
consistent with team_vlan_rx_add_vid.

Fixes: 3d249d4ca7d0 ("net: introduce ethernet teaming device")
Acked-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/team/team.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 2528331..718ceea 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1872,10 +1872,10 @@ static int team_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
 	struct team *team = netdev_priv(dev);
 	struct team_port *port;
 
-	rcu_read_lock();
-	list_for_each_entry_rcu(port, &team->port_list, list)
+	mutex_lock(&team->lock);
+	list_for_each_entry(port, &team->port_list, list)
 		vlan_vid_del(port->dev, proto, vid);
-	rcu_read_unlock();
+	mutex_unlock(&team->lock);
 
 	return 0;
 }
-- 
2.4.10