ipip: fix percpu stats accounting

commit 3c97af99a5aa1 (ipip: percpu stats accounting) forgot the fallback
tunnel case (tunl0), 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, 10 insertions, 3 deletions

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 12b6fde6f65a..9e78f11da786 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -789,7 +789,7 @@ static int ipip_tunnel_init(struct net_device *dev)
         return 0;
 }
 
-static void __net_init ipip_fb_tunnel_init(struct net_device *dev)
+static int __net_init ipip_fb_tunnel_init(struct net_device *dev)
 {
         struct ip_tunnel *tunnel = netdev_priv(dev);
         struct iphdr *iph = &tunnel->parms.iph;
@@ -802,8 +802,13 @@ static void __net_init ipip_fb_tunnel_init(struct net_device *dev)
         iph->protocol           = IPPROTO_IPIP;
         iph->ihl                = 5;
 
+        dev->tstats = alloc_percpu(struct pcpu_tstats);
+        if (!dev->tstats)
+                return -ENOMEM;
+
         dev_hold(dev);
         rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
+        return 0;
 }
 
 static struct xfrm_tunnel ipip_handler __read_mostly = {
@@ -852,7 +857,9 @@ static int __net_init ipip_init_net(struct net *net)
         }
         dev_net_set(ipn->fb_tunnel_dev, net);
 
-        ipip_fb_tunnel_init(ipn->fb_tunnel_dev);
+        err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev);
+        if (err)
+                goto err_reg_dev;
 
         if ((err = register_netdev(ipn->fb_tunnel_dev)))
                 goto err_reg_dev;
@@ -860,7 +867,7 @@ static int __net_init ipip_init_net(struct net *net)
         return 0;
 
 err_reg_dev:
-        free_netdev(ipn->fb_tunnel_dev);
+        ipip_dev_free(ipn->fb_tunnel_dev);
 err_alloc_dev:
         /* nothing */
         return err;