From patchwork Tue Jul 4 12:53:21 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Reshetova, Elena" X-Patchwork-Id: 9824889 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 5C3B1602F0 for ; Tue, 4 Jul 2017 13:02:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4E7B1280FC for ; Tue, 4 Jul 2017 13:02:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 42A202823E; Tue, 4 Jul 2017 13:02:27 +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=unavailable 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 E1B7D280FC for ; Tue, 4 Jul 2017 13:02:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753244AbdGDM5o (ORCPT ); Tue, 4 Jul 2017 08:57:44 -0400 Received: from mga01.intel.com ([192.55.52.88]:56986 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752173AbdGDM5m (ORCPT ); Tue, 4 Jul 2017 08:57:42 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Jul 2017 05:57:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.40,307,1496127600"; d="scan'208";a="1190388368" 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 05:57:22 -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 26/36] net, xfrm: convert xfrm_state.refcnt from atomic_t to refcount_t Date: Tue, 4 Jul 2017 15:53:21 +0300 Message-Id: <1499172811-16271-27-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/xfrm.h | 9 +++++---- net/xfrm/xfrm_state.c | 4 ++-- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 01fa357..f5272a2 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -137,7 +138,7 @@ struct xfrm_state { struct hlist_node bysrc; struct hlist_node byspi; - atomic_t refcnt; + refcount_t refcnt; spinlock_t lock; struct xfrm_id id; @@ -837,18 +838,18 @@ void __xfrm_state_destroy(struct xfrm_state *); static inline void __xfrm_state_put(struct xfrm_state *x) { - atomic_dec(&x->refcnt); + refcount_dec(&x->refcnt); } static inline void xfrm_state_put(struct xfrm_state *x) { - if (atomic_dec_and_test(&x->refcnt)) + if (refcount_dec_and_test(&x->refcnt)) __xfrm_state_destroy(x); } static inline void xfrm_state_hold(struct xfrm_state *x) { - atomic_inc(&x->refcnt); + refcount_inc(&x->refcnt); } static inline bool addr_match(const void *token1, const void *token2, diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 4a28f66..6c0956d 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -48,7 +48,7 @@ static HLIST_HEAD(xfrm_state_gc_list); static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) { - return atomic_inc_not_zero(&x->refcnt); + return refcount_inc_not_zero(&x->refcnt); } static inline unsigned int xfrm_dst_hash(struct net *net, @@ -558,7 +558,7 @@ struct xfrm_state *xfrm_state_alloc(struct net *net) if (x) { write_pnet(&x->xs_net, net); - atomic_set(&x->refcnt, 1); + refcount_set(&x->refcnt, 1); atomic_set(&x->tunnel_users, 0); INIT_LIST_HEAD(&x->km.all); INIT_HLIST_NODE(&x->bydst);