UBUNTU: SAUCE: net/netfilter/nf_conntrack_netlink.c: fix Oops on container destroy

[linux-flexiantxendom0-natty.git] / net / netfilter / nf_conntrack_netlink.c

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 7461402..00f033c 100644 (file)
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -528,6 +528,11 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
                return 0;
 
        net = nf_ct_net(ct);
+
+       /* container deinit, netlink may have died before death_by_timeout */
+       if (!net->nfnl)
+               return 0;
+
        if (!item->report && !nfnetlink_has_listeners(net, group))
                return 0;
 
@@ -645,30 +650,29 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
        struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
        u_int8_t l3proto = nfmsg->nfgen_family;
 
-       rcu_read_lock();
+       spin_lock_bh(&nf_conntrack_lock);
        last = (struct nf_conn *)cb->args[1];
        for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 restart:
-               hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
+               hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
                                         hnnode) {
                        if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
                                continue;
                        ct = nf_ct_tuplehash_to_ctrack(h);
-                       if (!atomic_inc_not_zero(&ct->ct_general.use))
-                               continue;
                        /* Dump entries of a given L3 protocol number.
                         * If it is not specified, ie. l3proto == 0,
                         * then dump everything. */
                        if (l3proto && nf_ct_l3num(ct) != l3proto)
-                               goto releasect;
+                               continue;
                        if (cb->args[1]) {
                                if (ct != last)
-                                       goto releasect;
+                                       continue;
                                cb->args[1] = 0;
                        }
                        if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
                                                cb->nlh->nlmsg_seq,
                                                IPCTNL_MSG_CT_NEW, ct) < 0) {
+                               nf_conntrack_get(&ct->ct_general);
                                cb->args[1] = (unsigned long)ct;
                                goto out;
                        }
@@ -681,8 +685,6 @@ restart:
                                if (acct)
                                        memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
                        }
-releasect:
-               nf_ct_put(ct);
                }
                if (cb->args[1]) {
                        cb->args[1] = 0;
@@ -690,7 +692,7 @@ releasect:
                }
        }
 out:
-       rcu_read_unlock();
+       spin_unlock_bh(&nf_conntrack_lock);
        if (last)
                nf_ct_put(last);
 
@@ -928,7 +930,7 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
        u16 zone;
        int err;
 
-       if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
+       if (nlh->nlmsg_flags & NLM_F_DUMP)
                return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
                                          ctnetlink_done);
 
@@ -976,7 +978,8 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 free:
        kfree_skb(skb2);
 out:
-       return err;
+       /* this avoids a loop in nfnetlink. */
+       return err == -EAGAIN ? -ENOBUFS : err;
 }
 
 #ifdef CONFIG_NF_NAT_NEEDED
@@ -1790,7 +1793,7 @@ ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
        u16 zone;
        int err;
 
-       if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
+       if (nlh->nlmsg_flags & NLM_F_DUMP) {
                return netlink_dump_start(ctnl, skb, nlh,
                                          ctnetlink_exp_dump_table,
                                          ctnetlink_exp_done);