IPVS: bug in ip_vs_ftp, same list heaad used in all netns.

When ip_vs was adapted to netns the ftp application was not adapted
in a correct way.
However this is a fix to avoid kernel errors. In the long term another solution
might be chosen.  I.e the ports that the ftp appl, uses should be per netns.

Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 19 insertions, 8 deletions

diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 6b5dd6ddaae9..af63553fa332 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -411,25 +411,35 @@ static struct ip_vs_app ip_vs_ftp = {
 static int __net_init __ip_vs_ftp_init(struct net *net)
 {
         int i, ret;
-        struct ip_vs_app *app = &ip_vs_ftp;
+        struct ip_vs_app *app;
+        struct netns_ipvs *ipvs = net_ipvs(net);
+
+        app = kmemdup(&ip_vs_ftp, sizeof(struct ip_vs_app), GFP_KERNEL);
+        if (!app)
+                return -ENOMEM;
+        INIT_LIST_HEAD(&app->a_list);
+        INIT_LIST_HEAD(&app->incs_list);
+        ipvs->ftp_app = app;
 
         ret = register_ip_vs_app(net, app);
         if (ret)
-                return ret;
+                goto err_exit;
 
         for (i=0; i<IP_VS_APP_MAX_PORTS; i++) {
                 if (!ports[i])
                         continue;
                 ret = register_ip_vs_app_inc(net, app, app->protocol, ports[i]);
                 if (ret)
-                        break;
+                        goto err_unreg;
                 pr_info("%s: loaded support on port[%d] = %d\n",
                         app->name, i, ports[i]);
         }
+        return 0;
 
-        if (ret)
-                unregister_ip_vs_app(net, app);
-
+err_unreg:
+        unregister_ip_vs_app(net, app);
+err_exit:
+        kfree(ipvs->ftp_app);
         return ret;
 }
 /*
@@ -437,9 +447,10 @@ static int __net_init __ip_vs_ftp_init(struct net *net)
  */
 static void __ip_vs_ftp_exit(struct net *net)
 {
-        struct ip_vs_app *app = &ip_vs_ftp;
+        struct netns_ipvs *ipvs = net_ipvs(net);
 
-        unregister_ip_vs_app(net, app);
+        unregister_ip_vs_app(net, ipvs->ftp_app);
+        kfree(ipvs->ftp_app);
 }
 
 static struct pernet_operations ip_vs_ftp_ops = {