linux-kernel - [PATCH 3.12 090/175] team: don't traverse port list using rcu in team_set_mac

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Message-Id: <c272044a55e2df31b31952149f71294615d7e1c3.1426581621.git.jslaby@suse.cz>
Date:	Tue, 17 Mar 2015 09:41:08 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 090/175] team: don't traverse port list using rcu in team_set_mac_address

From: Jiri Pirko <jiri@...nulli.us>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit 9215f437b85da339a7dfe3db6e288637406f88b2 ]

Currently the list is traversed using rcu variant. That is not correct
since dev_set_mac_address can be called which eventually calls
rtmsg_ifinfo_build_skb and there, skb allocation can sleep. So fix this
by remove the rcu usage here.

Fixes: 3d249d4ca7 "net: introduce ethernet teaming device"
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 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 b99f9198c916..020581ddfdd3 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1716,11 +1716,11 @@ static int team_set_mac_address(struct net_device *dev, void *p)
 	if (dev->type == ARPHRD_ETHER && !is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
-	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)
 		if (team->ops.port_change_dev_addr)
 			team->ops.port_change_dev_addr(team, port);
-	rcu_read_unlock();
+	mutex_unlock(&team->lock);
 	return 0;
 }
 
-- 
2.3.0

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