netfilter: fix two recent sysctl problems

Starting with 9043476f726802f4b00c96d0c4f418dde48d1304 ("[PATCH]
sanitize proc_sysctl") we have two netfilter releated problems:

 - WARNING: at kernel/sysctl.c:1966 unregister_sysctl_table+0xcc/0x103(),
   caused by wrong order of ini/fini calls

 - net.netfilter is duplicated and has truncated set of records

Thanks to very useful guidelines from Al Viro, this patch fixes both
of them.

Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 20 insertions, 14 deletions

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index c519d090bdb9..9d1830da8e84 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1032,10 +1032,10 @@ void nf_conntrack_cleanup(void)
         nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc,
                              nf_conntrack_htable_size);
 
-        nf_conntrack_proto_fini();
-        nf_conntrack_helper_fini();
-        nf_conntrack_expect_fini();
         nf_conntrack_acct_fini();
+        nf_conntrack_expect_fini();
+        nf_conntrack_helper_fini();
+        nf_conntrack_proto_fini();
 }
 
 struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced)
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 869ef9349d0f..8509db14670b 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -324,6 +324,7 @@ static int log_invalid_proto_min = 0;
 static int log_invalid_proto_max = 255;
 
 static struct ctl_table_header *nf_ct_sysctl_header;
+static struct ctl_table_header *nf_ct_netfilter_header;
 
 static ctl_table nf_ct_sysctl_table[] = {
         {
@@ -384,12 +385,6 @@ static ctl_table nf_ct_sysctl_table[] = {
 
 static ctl_table nf_ct_netfilter_table[] = {
         {
-                .ctl_name       = NET_NETFILTER,
-                .procname       = "netfilter",
-                .mode           = 0555,
-                .child          = nf_ct_sysctl_table,
-        },
-        {
                 .ctl_name       = NET_NF_CONNTRACK_MAX,
                 .procname       = "nf_conntrack_max",
                 .data           = &nf_conntrack_max,
@@ -409,18 +404,29 @@ EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 
 static int nf_conntrack_standalone_init_sysctl(void)
 {
-        nf_ct_sysctl_header =
+        nf_ct_netfilter_header =
                 register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
-        if (nf_ct_sysctl_header == NULL) {
-                printk("nf_conntrack: can't register to sysctl.\n");
-                return -ENOMEM;
-        }
+        if (!nf_ct_netfilter_header)
+                goto out;
+
+        nf_ct_sysctl_header =
+                 register_sysctl_paths(nf_net_netfilter_sysctl_path,
+                                        nf_ct_sysctl_table);
+        if (!nf_ct_sysctl_header)
+                goto out_unregister_netfilter;
+
         return 0;
 
+out_unregister_netfilter:
+        unregister_sysctl_table(nf_ct_netfilter_header);
+out:
+        printk("nf_conntrack: can't register to sysctl.\n");
+        return -ENOMEM;
 }
 
 static void nf_conntrack_standalone_fini_sysctl(void)
 {
+        unregister_sysctl_table(nf_ct_netfilter_header);
         unregister_sysctl_table(nf_ct_sysctl_header);
 }
 #else