net_sched: hold tcf_lock in netdevice notifier
We modify mirred action (m->tcfm_dev) in netdev event, we need to prevent on-going mirred actions from reading freed m->tcfm_dev. So we need to acquire this spin lock. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Cong Wang <cwang@twopensource.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -218,10 +218,12 @@ static int mirred_device_event(struct notifier_block *unused,
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if (event == NETDEV_UNREGISTER)
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list_for_each_entry(m, &mirred_list, tcfm_list) {
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spin_lock_bh(&m->tcf_lock);
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if (m->tcfm_dev == dev) {
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dev_put(dev);
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m->tcfm_dev = NULL;
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}
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spin_unlock_bh(&m->tcf_lock);
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}
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return NOTIFY_DONE;
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