sit: fix percpu stats accounting

commit 15fc1f7056ebd (sit: percpu stats accounting) forgot the fallback
tunnel case (sit0), and can crash pretty fast.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 3 deletions

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 011ecf55d34e..2cb646079237 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1160,7 +1160,7 @@ static int ipip6_tunnel_init(struct net_device *dev)
         return 0;
 }
 
-static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
+static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
 {
         struct ip_tunnel *tunnel = netdev_priv(dev);
         struct iphdr *iph = &tunnel->parms.iph;
@@ -1175,8 +1175,12 @@ static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
         iph->ihl                = 5;
         iph->ttl                = 64;
 
+        dev->tstats = alloc_percpu(struct pcpu_tstats);
+        if (!dev->tstats)
+                return -ENOMEM;
         dev_hold(dev);
         sitn->tunnels_wc[0]     = tunnel;
+        return 0;
 }
 
 static struct xfrm_tunnel sit_handler __read_mostly = {
@@ -1220,7 +1224,10 @@ static int __net_init sit_init_net(struct net *net)
         }
         dev_net_set(sitn->fb_tunnel_dev, net);
 
-        ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
+        err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
+        if (err)
+                goto err_dev_free;
+
         ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
 
         if ((err = register_netdev(sitn->fb_tunnel_dev)))
@@ -1230,7 +1237,8 @@ static int __net_init sit_init_net(struct net *net)
 
 err_reg_dev:
         dev_put(sitn->fb_tunnel_dev);
-        free_netdev(sitn->fb_tunnel_dev);
+err_dev_free:
+        ipip6_dev_free(sitn->fb_tunnel_dev);
 err_alloc_dev:
         return err;
 }