cls_u32: use tcf_exts_get_net() before call_rcu()
Hold netns refcnt before call_rcu() and release it after the tcf_exts_destroy() is done. Note, on ->destroy() path we have to respect the return value of tcf_exts_get_net(), on other paths it should always return true, so we don't need to care. Cc: Lucas Bates <lucasb@mojatatu.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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f2b751053e
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35c55fc156
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@ -399,6 +399,7 @@ static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
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bool free_pf)
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{
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tcf_exts_destroy(&n->exts);
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tcf_exts_put_net(&n->exts);
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if (n->ht_down)
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n->ht_down->refcnt--;
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#ifdef CONFIG_CLS_U32_PERF
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@ -476,6 +477,7 @@ static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
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RCU_INIT_POINTER(*kp, key->next);
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tcf_unbind_filter(tp, &key->res);
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tcf_exts_get_net(&key->exts);
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call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
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return 0;
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}
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@ -588,7 +590,10 @@ static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
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rtnl_dereference(n->next));
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tcf_unbind_filter(tp, &n->res);
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u32_remove_hw_knode(tp, n->handle);
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call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
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if (tcf_exts_get_net(&n->exts))
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call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
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else
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u32_destroy_key(n->tp, n, true);
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}
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}
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}
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@ -949,6 +954,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
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u32_replace_knode(tp, tp_c, new);
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tcf_unbind_filter(tp, &n->res);
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tcf_exts_get_net(&n->exts);
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call_rcu(&n->rcu, u32_delete_key_rcu);
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return 0;
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}
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