Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752482AbdGPOHQ (ORCPT ); Sun, 16 Jul 2017 10:07:16 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:43235 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751768AbdGPN55 (ORCPT ); Sun, 16 Jul 2017 09:57:57 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Guillaume Nault" , "David S. Miller" Date: Sun, 16 Jul 2017 14:56:46 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 143/178] l2tp: don't mask errors in pppol2tp_getsockopt() In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1191 Lines: 38 3.16.46-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Guillaume Nault commit 321a52a39189d5e4af542f7dcdc07bba4545cf5d upstream. pppol2tp_getsockopt() doesn't take into account the error code returned by pppol2tp_tunnel_getsockopt() or pppol2tp_session_getsockopt(). If error occurs there, pppol2tp_getsockopt() continues unconditionally and reports erroneous values. Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Signed-off-by: Guillaume Nault Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- net/l2tp/l2tp_ppp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1524,8 +1524,13 @@ static int pppol2tp_getsockopt(struct so err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); sock_put(ps->tunnel_sock); - } else + if (err) + goto end_put_sess; + } else { err = pppol2tp_session_getsockopt(sk, session, optname, &val); + if (err) + goto end_put_sess; + } err = -EFAULT; if (put_user(len, optlen))