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authorJiri Pirko <jiri@resnulli.us>2013-06-08 15:00:53 +0200
committerDavid S. Miller <davem@davemloft.net>2013-06-12 00:56:27 -0700
commit76c455decbbad31de21c727edb184a963f42b40b (patch)
treef62b5479531b2eec3323f0e8b71ed475c19fc5a1 /drivers/net/team
parent19a6afb23e5d323e1245baa4e62755492b2f1200 (diff)
team: check return value of team_get_port_by_index_rcu() for NULL
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@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/team')
-rw-r--r--drivers/net/team/team_mode_random.c2
-rw-r--r--drivers/net/team/team_mode_roundrobin.c2
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/team/team_mode_random.c b/drivers/net/team/team_mode_random.c
index 5ca14d463ba..7f032e21134 100644
--- a/drivers/net/team/team_mode_random.c
+++ b/drivers/net/team/team_mode_random.c
@@ -28,6 +28,8 @@ static bool rnd_transmit(struct team *team, struct sk_buff *skb)
port_index = random_N(team->en_port_count);
port = team_get_port_by_index_rcu(team, port_index);
+ if (unlikely(!port))
+ goto drop;
port = team_get_first_port_txable_rcu(team, port);
if (unlikely(!port))
goto drop;
diff --git a/drivers/net/team/team_mode_roundrobin.c b/drivers/net/team/team_mode_roundrobin.c
index d268e4de781..472623f8ce3 100644
--- a/drivers/net/team/team_mode_roundrobin.c
+++ b/drivers/net/team/team_mode_roundrobin.c
@@ -32,6 +32,8 @@ 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 = team_get_first_port_txable_rcu(team, port);
if (unlikely(!port))
goto drop;