From 252b3e8c1bc0c2b20348ae87d67efcd0a8209f72 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Tue, 11 Dec 2012 04:07:42 +0000 Subject: netfilter: xt_CT: fix crash while destroy ct templates In (d871bef netfilter: ctnetlink: dump entries from the dying and unconfirmed lists), we assume that all conntrack objects are inserted in any of the existing lists. However, template conntrack objects were not. This results in hitting BUG_ON in the destroy_conntrack path while removing a rule that uses the CT target. This patch fixes the situation by adding the template lists, which is where template conntrack objects reside now. Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_core.c | 2 ++ net/netfilter/xt_CT.c | 8 ++++++++ 2 files changed, 10 insertions(+) (limited to 'net') diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 08cdc71..016d95e 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1526,6 +1526,7 @@ err_extend: */ #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) #define DYING_NULLS_VAL ((1<<30)+1) +#define TEMPLATE_NULLS_VAL ((1<<30)+2) static int nf_conntrack_init_net(struct net *net) { @@ -1534,6 +1535,7 @@ static int nf_conntrack_init_net(struct net *net) atomic_set(&net->ct.count, 0); INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); + INIT_HLIST_NULLS_HEAD(&net->ct.tmpl, TEMPLATE_NULLS_VAL); net->ct.stat = alloc_percpu(struct ip_conntrack_stat); if (!net->ct.stat) { ret = -ENOMEM; diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c index ae7f5da..1668f41 100644 --- a/net/netfilter/xt_CT.c +++ b/net/netfilter/xt_CT.c @@ -149,6 +149,10 @@ static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par) __set_bit(IPS_TEMPLATE_BIT, &ct->status); __set_bit(IPS_CONFIRMED_BIT, &ct->status); + + /* Overload tuple linked list to put us in template list. */ + hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, + &par->net->ct.tmpl); out: info->ct = ct; return 0; @@ -289,6 +293,10 @@ static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par) __set_bit(IPS_TEMPLATE_BIT, &ct->status); __set_bit(IPS_CONFIRMED_BIT, &ct->status); + + /* Overload tuple linked list to put us in template list. */ + hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, + &par->net->ct.tmpl); out: info->ct = ct; return 0; -- cgit v1.1