linux-kernel - [PATCH 20/50] team: check return value of team_get_port_by_index

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Message-Id: <1372763258-20664-21-git-send-email-luis.henriques@canonical.com>
Date:	Tue,  2 Jul 2013 12:07:08 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 20/50] team: check return value of team_get_port_by_index_rcu() for NULL

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

------------------

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

commit 76c455decbbad31de21c727edb184a963f42b40b upstream.

team_get_port_by_index_rcu() might return NULL due to race between port
removal and skb tx path. Panic is easily triggeable when txing packets
and adding/removing port in a loop.

introduced by commit 3d249d4ca "net: introduce ethernet teaming device"
and commit 753f993911b "team: introduce random mode" (for random mode)

Signed-off-by: Jiri Pirko <jiri@...nulli.us>
Signed-off-by: David S. Miller <davem@...emloft.net>
[ luis: backported to 3.5: used davem's backport to 3.4:
  - adjusted context
  - dropped changes to team_mode_random.c ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/net/team/team_mode_roundrobin.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/team/team_mode_roundrobin.c b/drivers/net/team/team_mode_roundrobin.c
index 6abfbdc..d9a5e45 100644
--- a/drivers/net/team/team_mode_roundrobin.c
+++ b/drivers/net/team/team_mode_roundrobin.c
@@ -52,6 +52,8 @@ static bool rr_transmit(struct team *team, struct sk_buff *skb)
 
 	port_index = rr_priv(team)->sent_packets++ % team->en_port_count;
 	port = team_get_port_by_index_rcu(team, port_index);
+	if (unlikely(!port))
+		goto drop;
 	port = __get_first_port_up(team, port);
 	if (unlikely(!port))
 		goto drop;
-- 
1.8.1.2

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