From patchwork Fri Mar 17 12:10:31 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Reshetova, Elena" X-Patchwork-Id: 9630571 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 B974E60249 for ; Fri, 17 Mar 2017 12:18:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A5329285A9 for ; Fri, 17 Mar 2017 12:18:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9A0DB285D4; Fri, 17 Mar 2017 12:18:14 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID 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 3ED1A285A9 for ; Fri, 17 Mar 2017 12:18:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751297AbdCQMQ7 (ORCPT ); Fri, 17 Mar 2017 08:16:59 -0400 Received: from mga04.intel.com ([192.55.52.120]:63860 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751107AbdCQMQv (ORCPT ); Fri, 17 Mar 2017 08:16:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=intel; t=1489753010; x=1521289010; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=RuiFIxs/jaGZDBrAaHmJCDsQcJLuWj4TUXS2S9Zg0o0=; b=re4LbedPAyWwjUZTezXt86UZJ7aDkggEzkXFnb8IAVuXMV1rBGjVwTh3 AXmv9FQci/MSe+bMeOumh0nPgZznNw==; Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Mar 2017 05:11:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,176,1486454400"; d="scan'208";a="78173780" 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 05:11:44 -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 08/23] net, rds: convert rds_incoming.i_refcount from atomic_t to refcount_t Date: Fri, 17 Mar 2017 14:10:31 +0200 Message-Id: <1489752646-8749-9-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 --- net/rds/rds.h | 3 ++- net/rds/recv.c | 12 ++++++------ 2 files changed, 8 insertions(+), 7 deletions(-) diff --git a/net/rds/rds.h b/net/rds/rds.h index 966d2ee..d8070c7 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -8,6 +8,7 @@ #include #include #include +#include #include "info.h" @@ -260,7 +261,7 @@ struct rds_ext_header_rdma_dest { #define RDS_MSG_RX_CMSG 3 struct rds_incoming { - atomic_t i_refcount; + refcount_t i_refcount; struct list_head i_item; struct rds_connection *i_conn; struct rds_conn_path *i_conn_path; diff --git a/net/rds/recv.c b/net/rds/recv.c index 8b7e7b7..7d5e35e 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -45,7 +45,7 @@ void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, { int i; - atomic_set(&inc->i_refcount, 1); + refcount_set(&inc->i_refcount, 1); INIT_LIST_HEAD(&inc->i_item); inc->i_conn = conn; inc->i_saddr = saddr; @@ -61,7 +61,7 @@ EXPORT_SYMBOL_GPL(rds_inc_init); void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *cp, __be32 saddr) { - atomic_set(&inc->i_refcount, 1); + refcount_set(&inc->i_refcount, 1); INIT_LIST_HEAD(&inc->i_item); inc->i_conn = cp->cp_conn; inc->i_conn_path = cp; @@ -74,14 +74,14 @@ EXPORT_SYMBOL_GPL(rds_inc_path_init); static void rds_inc_addref(struct rds_incoming *inc) { - rdsdebug("addref inc %p ref %d\n", inc, atomic_read(&inc->i_refcount)); - atomic_inc(&inc->i_refcount); + rdsdebug("addref inc %p ref %d\n", inc, refcount_read(&inc->i_refcount)); + refcount_inc(&inc->i_refcount); } void rds_inc_put(struct rds_incoming *inc) { - rdsdebug("put inc %p ref %d\n", inc, atomic_read(&inc->i_refcount)); - if (atomic_dec_and_test(&inc->i_refcount)) { + rdsdebug("put inc %p ref %d\n", inc, refcount_read(&inc->i_refcount)); + if (refcount_dec_and_test(&inc->i_refcount)) { BUG_ON(!list_empty(&inc->i_item)); inc->i_conn->c_trans->inc_free(inc);