From patchwork Fri Mar 17 12:10:38 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Reshetova, Elena" X-Patchwork-Id: 9630597 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 9F12260249 for ; Fri, 17 Mar 2017 12:18:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8B1A6285A9 for ; Fri, 17 Mar 2017 12:18:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7FADE285D4; Fri, 17 Mar 2017 12:18:59 +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 3011F285A9 for ; Fri, 17 Mar 2017 12:18:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751170AbdCQMQx (ORCPT ); Fri, 17 Mar 2017 08:16:53 -0400 Received: from mga05.intel.com ([192.55.52.43]:50936 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751023AbdCQMQu (ORCPT ); Fri, 17 Mar 2017 08:16:50 -0400 Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP; 17 Mar 2017 05:12:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,176,1486454400"; d="scan'208";a="78174027" Received: from pduchene-mobl.ger.corp.intel.com (HELO elena-ThinkPad-X230.ger.corp.intel.com) ([10.249.42.127]) by fmsmga006.fm.intel.com with ESMTP; 17 Mar 2017 05:12:30 -0700 From: Elena Reshetova To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, davem@davemloft.net, linux-x25@vger.kernel.org, linux-sctp@vger.kernel.org, vyasevich@gmail.com, nhorman@tuxdriver.com, linux-hams@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@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, ralf@linux-mips.org, peterz@infradead.org, keescook@chromium.org, Elena Reshetova , Hans Liljestrand , David Windsor Subject: [PATCH 15/23] net, xfrm: convert sec_path.refcnt from atomic_t to refcount_t Date: Fri, 17 Mar 2017 14:10:38 +0200 Message-Id: <1489752646-8749-16-git-send-email-elena.reshetova@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1489752646-8749-1-git-send-email-elena.reshetova@intel.com> References: <1489752646-8749-1-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 | 6 +++--- net/xfrm/xfrm_input.c | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index be30846..35d1cca 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -1005,7 +1005,7 @@ struct xfrm_offload { }; struct sec_path { - atomic_t refcnt; + refcount_t refcnt; int len; int olen; @@ -1026,7 +1026,7 @@ static inline struct sec_path * secpath_get(struct sec_path *sp) { if (sp) - atomic_inc(&sp->refcnt); + refcount_inc(&sp->refcnt); return sp; } @@ -1035,7 +1035,7 @@ void __secpath_destroy(struct sec_path *sp); static inline void secpath_put(struct sec_path *sp) { - if (sp && atomic_dec_and_test(&sp->refcnt)) + if (sp && refcount_dec_and_test(&sp->refcnt)) __secpath_destroy(sp); } diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index 46bdb4f..203ba90 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -114,7 +114,7 @@ struct sec_path *secpath_dup(struct sec_path *src) for (i = 0; i < sp->len; i++) xfrm_state_hold(sp->xvec[i]); } - atomic_set(&sp->refcnt, 1); + refcount_set(&sp->refcnt, 1); return sp; } EXPORT_SYMBOL(secpath_dup); @@ -124,7 +124,7 @@ int secpath_set(struct sk_buff *skb) struct sec_path *sp; /* Allocate new secpath or COW existing one. */ - if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { + if (!skb->sp || refcount_read(&skb->sp->refcnt) != 1) { sp = secpath_dup(skb->sp); if (!sp) return -ENOMEM;