From patchwork Tue Jul 4 12:53:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Reshetova, Elena" X-Patchwork-Id: 9824825 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 40CF4602F0 for ; Tue, 4 Jul 2017 12:57:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 317AC27FB7 for ; Tue, 4 Jul 2017 12:57:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 261642811E; Tue, 4 Jul 2017 12:57:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2F88327FB7 for ; Tue, 4 Jul 2017 12:57:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752718AbdGDM5c (ORCPT ); Tue, 4 Jul 2017 08:57:32 -0400 Received: from mga07.intel.com ([134.134.136.100]:60652 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752173AbdGDM5a (ORCPT ); Tue, 4 Jul 2017 08:57:30 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP; 04 Jul 2017 05:57:13 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.40,307,1496127600"; d="scan'208";a="1190388311" Received: from asteingr-mobl2.ger.corp.intel.com (HELO elena-ThinkPad-X230.ger.corp.intel.com) ([10.252.43.132]) by fmsmga002.fm.intel.com with ESMTP; 04 Jul 2017 05:57:05 -0700 From: Elena Reshetova To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, davem@davemloft.net, jmorris@namei.org, kaber@trash.net, yoshfuji@linux-ipv6.org, kuznet@ms2.inr.ac.ru, 3chas3@gmail.com, ralf@linux-mips.org, stephen@networkplumber.org, jchapman@katalix.com, jhs@mojatatu.com, bridge@lists.linux-foundation.org, linux-hams@vger.kernel.org, linux-x25@vger.kernel.org, peterz@infradead.org, keescook@chromium.org, linux-rdma@vger.kernel.org, linux-sctp@vger.kernel.org, vyasevich@gmail.com, nhorman@tuxdriver.com, linux-nfs@vger.kernel.org, zyan@redhat.com, sage@redhat.com, bfields@fieldses.org, jlayton@poochiereds.net, steffen.klassert@secunet.com, herbert@gondor.apana.org.au, santosh.shilimkar@oracle.com, jreuter@yaina.de, Elena Reshetova , Hans Liljestrand , David Windsor Subject: [PATCH 24/36] net, x25: convert x25_route.refcnt from atomic_t to refcount_t Date: Tue, 4 Jul 2017 15:53:19 +0300 Message-Id: <1499172811-16271-25-git-send-email-elena.reshetova@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1499172811-16271-1-git-send-email-elena.reshetova@intel.com> References: <1499172811-16271-1-git-send-email-elena.reshetova@intel.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor --- include/net/x25.h | 7 ++++--- net/x25/x25_route.c | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/include/net/x25.h b/include/net/x25.h index 6d30a01..1ac1400 100644 --- a/include/net/x25.h +++ b/include/net/x25.h @@ -11,6 +11,7 @@ #define _X25_H #include #include +#include #include #define X25_ADDR_LEN 16 @@ -129,7 +130,7 @@ struct x25_route { struct x25_address address; unsigned int sigdigits; struct net_device *dev; - atomic_t refcnt; + refcount_t refcnt; }; struct x25_neigh { @@ -265,12 +266,12 @@ void x25_route_free(void); static __inline__ void x25_route_hold(struct x25_route *rt) { - atomic_inc(&rt->refcnt); + refcount_inc(&rt->refcnt); } static __inline__ void x25_route_put(struct x25_route *rt) { - if (atomic_dec_and_test(&rt->refcnt)) + if (refcount_dec_and_test(&rt->refcnt)) kfree(rt); } diff --git a/net/x25/x25_route.c b/net/x25/x25_route.c index 277c8d2..b85b889 100644 --- a/net/x25/x25_route.c +++ b/net/x25/x25_route.c @@ -55,7 +55,7 @@ static int x25_add_route(struct x25_address *address, unsigned int sigdigits, rt->sigdigits = sigdigits; rt->dev = dev; - atomic_set(&rt->refcnt, 1); + refcount_set(&rt->refcnt, 1); list_add(&rt->node, &x25_route_list); rc = 0;