Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933289AbbLGQDF (ORCPT ); Mon, 7 Dec 2015 11:03:05 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:59110 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933247AbbLGO6U (ORCPT ); Mon, 7 Dec 2015 09:58:20 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , Dmitry Vyukov , Steffen Klassert , "David S. Miller" Subject: [PATCH 4.2 022/124] sit: fix sit0 percpu double allocations Date: Mon, 7 Dec 2015 09:55:12 -0500 Message-Id: <20151207144920.745035712@linuxfoundation.org> X-Mailer: git-send-email 2.6.3 In-Reply-To: <20151207144919.656035367@linuxfoundation.org> References: <20151207144919.656035367@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3000 Lines: 102 4.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 4ece9009774596ee3df0acba65a324b7ea79387c ] sit0 device allocates its percpu storage twice : - One time in ipip6_tunnel_init() - One time in ipip6_fb_tunnel_init() Thus we leak 48 bytes per possible cpu per network namespace dismantle. ipip6_fb_tunnel_init() can be much simpler and does not return an error, and should be called after register_netdev() Note that ipip6_tunnel_clone_6rd() also needs to be called after register_netdev() (calling ipip6_tunnel_init()) Fixes: ebe084aafb7e ("sit: Use ipip6_tunnel_init as the ndo_init function.") Signed-off-by: Eric Dumazet Reported-by: Dmitry Vyukov Cc: Steffen Klassert Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/sit.c | 26 ++++---------------------- 1 file changed, 4 insertions(+), 22 deletions(-) --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1394,34 +1394,20 @@ static int ipip6_tunnel_init(struct net_ return 0; } -static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) +static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); struct iphdr *iph = &tunnel->parms.iph; struct net *net = dev_net(dev); struct sit_net *sitn = net_generic(net, sit_net_id); - tunnel->dev = dev; - tunnel->net = dev_net(dev); - iph->version = 4; iph->protocol = IPPROTO_IPV6; iph->ihl = 5; iph->ttl = 64; - dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); - if (!dev->tstats) - return -ENOMEM; - - tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst); - if (!tunnel->dst_cache) { - free_percpu(dev->tstats); - return -ENOMEM; - } - dev_hold(dev); rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); - return 0; } static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[]) @@ -1831,23 +1817,19 @@ static int __net_init sit_init_net(struc */ sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; - err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); - if (err) - goto err_dev_free; - - ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); err = register_netdev(sitn->fb_tunnel_dev); if (err) goto err_reg_dev; + ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); + ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); + t = netdev_priv(sitn->fb_tunnel_dev); strcpy(t->parms.name, sitn->fb_tunnel_dev->name); return 0; err_reg_dev: - dev_put(sitn->fb_tunnel_dev); -err_dev_free: ipip6_dev_free(sitn->fb_tunnel_dev); err_alloc_dev: return err; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/