Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752913AbdHIUjq (ORCPT ); Wed, 9 Aug 2017 16:39:46 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:44350 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752855AbdHIUjo (ORCPT ); Wed, 9 Aug 2017 16:39:44 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dmitry Vyukov , Steffen Klassert Subject: [PATCH 3.18 50/92] xfrm: Dont use sk_family for socket policy lookups Date: Wed, 9 Aug 2017 13:37:18 -0700 Message-Id: <20170809202157.586822324@linuxfoundation.org> X-Mailer: git-send-email 2.14.0 In-Reply-To: <20170809202155.435709888@linuxfoundation.org> References: <20170809202155.435709888@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2124 Lines: 63 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steffen Klassert commit 4c86d77743a54fb2d8a4d18a037a074c892bb3be upstream. On IPv4-mapped IPv6 addresses sk_family is AF_INET6, but the flow informations are created based on AF_INET. So the routing set up 'struct flowi4' but we try to access 'struct flowi6' what leads to an out of bounds access. Fix this by using the family we get with the dst_entry, like we do it for the standard policy lookup. Reported-by: Dmitry Vyukov Tested-by: Dmitry Vyukov Signed-off-by: Steffen Klassert Signed-off-by: Greg Kroah-Hartman --- net/xfrm/xfrm_policy.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1211,15 +1211,14 @@ static inline int policy_to_flow_dir(int } static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, - const struct flowi *fl) + const struct flowi *fl, u16 family) { struct xfrm_policy *pol; struct net *net = sock_net(sk); read_lock_bh(&net->xfrm.xfrm_policy_lock); if ((pol = sk->sk_policy[dir]) != NULL) { - bool match = xfrm_selector_match(&pol->selector, fl, - sk->sk_family); + bool match = xfrm_selector_match(&pol->selector, fl, family); int err = 0; if (match) { @@ -2150,7 +2149,7 @@ struct dst_entry *xfrm_lookup(struct net if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { num_pols = 1; - pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); + pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family); err = xfrm_expand_policies(fl, family, pols, &num_pols, &num_xfrms); if (err < 0) @@ -2428,7 +2427,7 @@ int __xfrm_policy_check(struct sock *sk, pol = NULL; if (sk && sk->sk_policy[dir]) { - pol = xfrm_sk_policy_lookup(sk, dir, &fl); + pol = xfrm_sk_policy_lookup(sk, dir, &fl, family); if (IS_ERR(pol)) { XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); return 0;