net_sched: fix a NULL pointer deref in ipt action

The net pointer in struct xt_tgdtor_param is not explicitly
initialized therefore is still NULL when dereferencing it.
So we have to find a way to pass the correct net pointer to
ipt_destroy_target().

The best way I find is just saving the net pointer inside the per
netns struct tcf_idrinfo, which could make this patch smaller.

Fixes: 0c66dc1ea3f0 ("netfilter: conntrack: register hooks in netns when needed by ruleset")
Reported-and-tested-by: itugrok@yahoo.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>

diff --git a/include/net/act_api.h b/include/net/act_api.h
index c61a1bf..3a1a729 100644 (file)
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -15,6 +15,7 @@
 struct tcf_idrinfo {
        struct mutex    lock;
        struct idr      action_idr;
+       struct net      *net;
 };
 
 struct tc_action_ops;
@@ -108,7 +109,7 @@ struct tc_action_net {
 };
 
 static inline
-int tc_action_net_init(struct tc_action_net *tn,
+int tc_action_net_init(struct net *net, struct tc_action_net *tn,
                       const struct tc_action_ops *ops)
 {
        int err = 0;
@@ -117,6 +118,7 @@ int tc_action_net_init(struct tc_action_net *tn,
        if (!tn->idrinfo)
                return -ENOMEM;
        tn->ops = ops;
+       tn->idrinfo->net = net;
        mutex_init(&tn->idrinfo->lock);
        idr_init(&tn->idrinfo->action_idr);
        return err;

diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index fd1f7e7..04b7bd4 100644 (file)
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c
@@ -422,7 +422,7 @@ static __net_init int bpf_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, bpf_net_id);
 
-       return tc_action_net_init(tn, &act_bpf_ops);
+       return tc_action_net_init(net, tn, &act_bpf_ops);
 }
 
 static void __net_exit bpf_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
index 32ac04d..2b43cac 100644 (file)
--- a/net/sched/act_connmark.c
+++ b/net/sched/act_connmark.c
@@ -231,7 +231,7 @@ static __net_init int connmark_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, connmark_net_id);
 
-       return tc_action_net_init(tn, &act_connmark_ops);
+       return tc_action_net_init(net, tn, &act_connmark_ops);
 }
 
 static void __net_exit connmark_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index 9b92882..d3cfad8 100644 (file)
--- a/net/sched/act_csum.c
+++ b/net/sched/act_csum.c
@@ -714,7 +714,7 @@ static __net_init int csum_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, csum_net_id);
 
-       return tc_action_net_init(tn, &act_csum_ops);
+       return tc_action_net_init(net, tn, &act_csum_ops);
 }
 
 static void __net_exit csum_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 33a1a74..cdd6f38 100644 (file)
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -939,7 +939,7 @@ static __net_init int ct_init_net(struct net *net)
                tn->labels = true;
        }
 
-       return tc_action_net_init(&tn->tn, &act_ct_ops);
+       return tc_action_net_init(net, &tn->tn, &act_ct_ops);
 }
 
 static void __net_exit ct_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c
index 06ef74b..0dbcfd1 100644 (file)
--- a/net/sched/act_ctinfo.c
+++ b/net/sched/act_ctinfo.c
@@ -376,7 +376,7 @@ static __net_init int ctinfo_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
 
-       return tc_action_net_init(tn, &act_ctinfo_ops);
+       return tc_action_net_init(net, tn, &act_ctinfo_ops);
 }
 
 static void __net_exit ctinfo_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index 8f0140c..324f1d1 100644 (file)
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -278,7 +278,7 @@ static __net_init int gact_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, gact_net_id);
 
-       return tc_action_net_init(tn, &act_gact_ops);
+       return tc_action_net_init(net, tn, &act_gact_ops);
 }
 
 static void __net_exit gact_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
index 92ee853..3a31e24 100644 (file)
--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -890,7 +890,7 @@ static __net_init int ife_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, ife_net_id);
 
-       return tc_action_net_init(tn, &act_ife_ops);
+       return tc_action_net_init(net, tn, &act_ife_ops);
 }
 
 static void __net_exit ife_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index ce2c30a..214a03d 100644 (file)
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -61,12 +61,13 @@ static int ipt_init_target(struct net *net, struct xt_entry_target *t,
        return 0;
 }
 
-static void ipt_destroy_target(struct xt_entry_target *t)
+static void ipt_destroy_target(struct xt_entry_target *t, struct net *net)
 {
        struct xt_tgdtor_param par = {
                .target   = t->u.kernel.target,
                .targinfo = t->data,
                .family   = NFPROTO_IPV4,
+               .net      = net,
        };
        if (par.target->destroy != NULL)
                par.target->destroy(&par);
@@ -78,7 +79,7 @@ static void tcf_ipt_release(struct tc_action *a)
        struct tcf_ipt *ipt = to_ipt(a);
 
        if (ipt->tcfi_t) {
-               ipt_destroy_target(ipt->tcfi_t);
+               ipt_destroy_target(ipt->tcfi_t, a->idrinfo->net);
                kfree(ipt->tcfi_t);
        }
        kfree(ipt->tcfi_tname);
@@ -180,7 +181,7 @@ static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla,
 
        spin_lock_bh(&ipt->tcf_lock);
        if (ret != ACT_P_CREATED) {
-               ipt_destroy_target(ipt->tcfi_t);
+               ipt_destroy_target(ipt->tcfi_t, net);
                kfree(ipt->tcfi_tname);
                kfree(ipt->tcfi_t);
        }
@@ -350,7 +351,7 @@ static __net_init int ipt_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, ipt_net_id);
 
-       return tc_action_net_init(tn, &act_ipt_ops);
+       return tc_action_net_init(net, tn, &act_ipt_ops);
 }
 
 static void __net_exit ipt_exit_net(struct list_head *net_list)
@@ -399,7 +400,7 @@ static __net_init int xt_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, xt_net_id);
 
-       return tc_action_net_init(tn, &act_xt_ops);
+       return tc_action_net_init(net, tn, &act_xt_ops);
 }
 
 static void __net_exit xt_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index be3f88d..9d1bf50 100644 (file)
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -453,7 +453,7 @@ static __net_init int mirred_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, mirred_net_id);
 
-       return tc_action_net_init(tn, &act_mirred_ops);
+       return tc_action_net_init(net, tn, &act_mirred_ops);
 }
 
 static void __net_exit mirred_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_mpls.c b/net/sched/act_mpls.c
index 0f299e3..e168df0 100644 (file)
--- a/net/sched/act_mpls.c
+++ b/net/sched/act_mpls.c
@@ -375,7 +375,7 @@ static __net_init int mpls_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, mpls_net_id);
 
-       return tc_action_net_init(tn, &act_mpls_ops);
+       return tc_action_net_init(net, tn, &act_mpls_ops);
 }
 
 static void __net_exit mpls_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index 7b858c1..ea4c535 100644 (file)
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -327,7 +327,7 @@ static __net_init int nat_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, nat_net_id);
 
-       return tc_action_net_init(tn, &act_nat_ops);
+       return tc_action_net_init(net, tn, &act_nat_ops);
 }
 
 static void __net_exit nat_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index 17360c6..cdfaa79 100644 (file)
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -498,7 +498,7 @@ static __net_init int pedit_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, pedit_net_id);
 
-       return tc_action_net_init(tn, &act_pedit_ops);
+       return tc_action_net_init(net, tn, &act_pedit_ops);
 }
 
 static void __net_exit pedit_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 49cec3e..6315e0f 100644 (file)
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -371,7 +371,7 @@ static __net_init int police_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, police_net_id);
 
-       return tc_action_net_init(tn, &act_police_ops);
+       return tc_action_net_init(net, tn, &act_police_ops);
 }
 
 static void __net_exit police_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index 595308d..7eff363 100644 (file)
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -265,7 +265,7 @@ static __net_init int sample_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, sample_net_id);
 
-       return tc_action_net_init(tn, &act_sample_ops);
+       return tc_action_net_init(net, tn, &act_sample_ops);
 }
 
 static void __net_exit sample_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 33aefa2..6120e56 100644 (file)
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -232,7 +232,7 @@ static __net_init int simp_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, simp_net_id);
 
-       return tc_action_net_init(tn, &act_simp_ops);
+       return tc_action_net_init(net, tn, &act_simp_ops);
 }
 
 static void __net_exit simp_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index 37dced0..6a8d333 100644 (file)
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -336,7 +336,7 @@ static __net_init int skbedit_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 
-       return tc_action_net_init(tn, &act_skbedit_ops);
+       return tc_action_net_init(net, tn, &act_skbedit_ops);
 }
 
 static void __net_exit skbedit_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_skbmod.c b/net/sched/act_skbmod.c
index 7da3518..888437f 100644 (file)
--- a/net/sched/act_skbmod.c
+++ b/net/sched/act_skbmod.c
@@ -287,7 +287,7 @@ static __net_init int skbmod_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, skbmod_net_id);
 
-       return tc_action_net_init(tn, &act_skbmod_ops);
+       return tc_action_net_init(net, tn, &act_skbmod_ops);
 }
 
 static void __net_exit skbmod_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index 6d0debd..2f83a79 100644 (file)
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -600,7 +600,7 @@ static __net_init int tunnel_key_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
 
-       return tc_action_net_init(tn, &act_tunnel_key_ops);
+       return tc_action_net_init(net, tn, &act_tunnel_key_ops);
 }
 
 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)

diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
index a3c9eea..287a30b 100644 (file)
--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -334,7 +334,7 @@ static __net_init int vlan_init_net(struct net *net)
 {
        struct tc_action_net *tn = net_generic(net, vlan_net_id);
 
-       return tc_action_net_init(tn, &act_vlan_ops);
+       return tc_action_net_init(net, tn, &act_vlan_ops);
 }
 
 static void __net_exit vlan_exit_net(struct list_head *net_list)