netfilter: remove unnecessary goto statement for error recovery

Usually it's a good practice to use goto statement for error recovery
when initializing the module. This approach could be an overkill if:

 1) there is only one fail case;
 2) success and failure use the same return statement.

For a cleaner approach, remove the unnecessary goto statement and
directly implement error recovery.

Signed-off-by: Jean Sacren <sakiwit@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 3 insertions, 15 deletions

diff --git a/net/ipv4/netfilter/iptable_filter.c b/net/ipv4/netfilter/iptable_filter.c
index d20cc374025c..6b3da5cf54e9 100644
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -94,14 +94,10 @@ static int __init iptable_filter_init(void)
         filter_ops = xt_hook_link(&packet_filter, iptable_filter_hook);
         if (IS_ERR(filter_ops)) {
                 ret = PTR_ERR(filter_ops);
-                goto cleanup_table;
+                unregister_pernet_subsys(&iptable_filter_net_ops);
         }
 
         return ret;
-
- cleanup_table:
-        unregister_pernet_subsys(&iptable_filter_net_ops);
-        return ret;
 }
 
 static void __exit iptable_filter_fini(void)
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index f38b94288cf5..85d88f206447 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -129,14 +129,10 @@ static int __init iptable_mangle_init(void)
         mangle_ops = xt_hook_link(&packet_mangler, iptable_mangle_hook);
         if (IS_ERR(mangle_ops)) {
                 ret = PTR_ERR(mangle_ops);
-                goto cleanup_table;
+                unregister_pernet_subsys(&iptable_mangle_net_ops);
         }
 
         return ret;
-
- cleanup_table:
-        unregister_pernet_subsys(&iptable_mangle_net_ops);
-        return ret;
 }
 
 static void __exit iptable_mangle_fini(void)
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
index b21e2191e2f5..03d9696d3c6e 100644
--- a/net/ipv4/netfilter/iptable_raw.c
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -73,14 +73,10 @@ static int __init iptable_raw_init(void)
         rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
         if (IS_ERR(rawtable_ops)) {
                 ret = PTR_ERR(rawtable_ops);
-                goto cleanup_table;
+                unregister_pernet_subsys(&iptable_raw_net_ops);
         }
 
         return ret;
-
- cleanup_table:
-        unregister_pernet_subsys(&iptable_raw_net_ops);
-        return ret;
 }
 
 static void __exit iptable_raw_fini(void)