linux-kernel - [PATCH 5.4 121/434] team: call RCU read lock when walking the port

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Message-Id: <20191229172709.730653086@linuxfoundation.org>
Date:   Sun, 29 Dec 2019 18:22:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Hangbin Liu <liuhangbin@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 121/434] team: call RCU read lock when walking the port_list

From: Hangbin Liu <liuhangbin@...il.com>

[ Upstream commit c17e26ddc79596230834345be80fcad6c619e9ec ]

Before reading the team port list, we need to acquire the RCU read lock.
Also change list_for_each_entry() to list_for_each_entry_rcu().

v2:
repost the patch to net-next and remove fixes flag as this is a cosmetic
change.

Suggested-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
Acked-by: Paolo Abeni <pabeni@...hat.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/team/team.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 8156b33ee3e7..ca70a1d840eb 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2074,7 +2074,8 @@ static int team_ethtool_get_link_ksettings(struct net_device *dev,
 	cmd->base.duplex = DUPLEX_UNKNOWN;
 	cmd->base.port = PORT_OTHER;
 
-	list_for_each_entry(port, &team->port_list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(port, &team->port_list, list) {
 		if (team_port_txable(port)) {
 			if (port->state.speed != SPEED_UNKNOWN)
 				speed += port->state.speed;
@@ -2083,6 +2084,8 @@ static int team_ethtool_get_link_ksettings(struct net_device *dev,
 				cmd->base.duplex = port->state.duplex;
 		}
 	}
+	rcu_read_unlock();
+
 	cmd->base.speed = speed ? : SPEED_UNKNOWN;
 
 	return 0;
-- 
2.20.1