From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:35720 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937708AbeE1KpH (ORCPT ); Mon, 28 May 2018 06:45:07 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xin Long , Steffen Klassert , Sasha Levin Subject: [PATCH 4.14 090/496] xfrm: do not call rcu_read_unlock when afinfo is NULL in xfrm_get_tos Date: Mon, 28 May 2018 11:57:55 +0200 Message-Id: <20180528100323.596482294@linuxfoundation.org> In-Reply-To: <20180528100319.498712256@linuxfoundation.org> References: <20180528100319.498712256@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xin Long [ Upstream commit 143a4454daaf0e80a2b9f37159a0d6d2b61e64ed ] When xfrm_policy_get_afinfo returns NULL, it will not hold rcu read lock. In this case, rcu_read_unlock should not be called in xfrm_get_tos, just like other places where it's calling xfrm_policy_get_afinfo. Fixes: f5e2bb4f5b22 ("xfrm: policy: xfrm_get_tos cannot fail") Signed-off-by: Xin Long Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/xfrm/xfrm_policy.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1459,10 +1459,13 @@ xfrm_tmpl_resolve(struct xfrm_policy **p static int xfrm_get_tos(const struct flowi *fl, int family) { const struct xfrm_policy_afinfo *afinfo; - int tos = 0; + int tos; afinfo = xfrm_policy_get_afinfo(family); - tos = afinfo ? afinfo->get_tos(fl) : 0; + if (!afinfo) + return 0; + + tos = afinfo->get_tos(fl); rcu_read_unlock();