From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E34A3C74A21 for ; Wed, 10 Jul 2019 13:11:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C090D20838 for ; Wed, 10 Jul 2019 13:11:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727510AbfGJNLk (ORCPT ); Wed, 10 Jul 2019 09:11:40 -0400 Received: from host.76.145.23.62.rev.coltfrance.com ([62.23.145.76]:45744 "EHLO proxy.6wind.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725911AbfGJNLk (ORCPT ); Wed, 10 Jul 2019 09:11:40 -0400 Received: from bretzel.dev.6wind.com (unknown [10.16.0.19]) by proxy.6wind.com (Postfix) with ESMTPS id 9E14B2E4624; Wed, 10 Jul 2019 15:11:38 +0200 (CEST) Received: from dichtel by bretzel.dev.6wind.com with local (Exim 4.89) (envelope-from ) id 1hlCNm-0001GU-HP; Wed, 10 Jul 2019 15:11:38 +0200 From: Nicolas Dichtel To: steffen.klassert@secunet.com, davem@davemloft.net Cc: netdev@vger.kernel.org, Nicolas Dichtel , Julien Floret Subject: [PATCH ipsec] xfrm interface: fix list corruption for x-netns Date: Wed, 10 Jul 2019 15:11:37 +0200 Message-Id: <20190710131137.4787-1-nicolas.dichtel@6wind.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org dev_net(dev) is the netns of the device and xi->net is the link netns, where the device has been linked. changelink() must operate in the link netns to avoid a corruption of the xfrm lists. Note that xi->net and dev_net(xi->physdev) are always the same. Before the patch, the xfrmi lists may be corrupted and can later trigger a kernel panic. Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces") Reported-by: Julien Floret Signed-off-by: Nicolas Dichtel Tested-by: Julien Floret --- net/xfrm/xfrm_interface.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c index a60d391f7ebe..9c5bc8dcf608 100644 --- a/net/xfrm/xfrm_interface.c +++ b/net/xfrm/xfrm_interface.c @@ -503,7 +503,7 @@ static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) { - struct net *net = dev_net(xi->dev); + struct net *net = xi->net; struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); int err; @@ -663,9 +663,9 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { - struct net *net = dev_net(dev); + struct xfrm_if *xi = netdev_priv(dev); + struct net *net = xi->net; struct xfrm_if_parms p; - struct xfrm_if *xi; xfrmi_netlink_parms(data, &p); xi = xfrmi_locate(net, &p); @@ -707,7 +707,7 @@ static struct net *xfrmi_get_link_net(const struct net_device *dev) { struct xfrm_if *xi = netdev_priv(dev); - return dev_net(xi->phydev); + return xi->net; } static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { -- 2.21.0