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act_mirred: fix a race condition on mirred_list
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After commit 1ce8772 ("net: sched: make cls_u32 lockless")
we began to release tc actions in a RCU callback. However,
mirred action relies on RTNL lock to protect the global
mirred_list, therefore we could have a race condition
between RCU callback and netdevice event, which caused
a list corruption as reported by Vinson.

Instead of relying on RTNL lock, introduce a spinlock to
protect this list.

Note, in non-bind case, it is still called with RTNL lock,
therefore should disable BH too.

Reported-by: Vinson Lee <vlee@twopensource.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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WANG Cong authored and David S. Miller committed Oct 5, 2015
1 parent fec31ff commit 6bd00b8
Showing 1 changed file with 10 additions and 1 deletion.
11 changes: 10 additions & 1 deletion net/sched/act_mirred.c
Original file line number Diff line number Diff line change
Expand Up @@ -31,13 +31,17 @@

#define MIRRED_TAB_MASK 7
static LIST_HEAD(mirred_list);
static DEFINE_SPINLOCK(mirred_list_lock);

static void tcf_mirred_release(struct tc_action *a, int bind)
{
struct tcf_mirred *m = to_mirred(a);
struct net_device *dev = rcu_dereference_protected(m->tcfm_dev, 1);

/* We could be called either in a RCU callback or with RTNL lock held. */
spin_lock_bh(&mirred_list_lock);
list_del(&m->tcfm_list);
spin_unlock_bh(&mirred_list_lock);
if (dev)
dev_put(dev);
}
Expand Down Expand Up @@ -123,7 +127,9 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
}

if (ret == ACT_P_CREATED) {
spin_lock_bh(&mirred_list_lock);
list_add(&m->tcfm_list, &mirred_list);
spin_unlock_bh(&mirred_list_lock);
tcf_hash_insert(a);
}

Expand Down Expand Up @@ -221,7 +227,8 @@ static int mirred_device_event(struct notifier_block *unused,
struct tcf_mirred *m;

ASSERT_RTNL();
if (event == NETDEV_UNREGISTER)
if (event == NETDEV_UNREGISTER) {
spin_lock_bh(&mirred_list_lock);
list_for_each_entry(m, &mirred_list, tcfm_list) {
if (rcu_access_pointer(m->tcfm_dev) == dev) {
dev_put(dev);
Expand All @@ -231,6 +238,8 @@ static int mirred_device_event(struct notifier_block *unused,
RCU_INIT_POINTER(m->tcfm_dev, NULL);
}
}
spin_unlock_bh(&mirred_list_lock);
}

return NOTIFY_DONE;
}
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