From patchwork Fri Mar 17 12:10:30 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Reshetova, Elena" X-Patchwork-Id: 9630511 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 82DE260249 for ; Fri, 17 Mar 2017 12:12:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E6F5284C2 for ; Fri, 17 Mar 2017 12:12:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62CAC28528; Fri, 17 Mar 2017 12:12:39 +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 0F6AB285A1 for ; Fri, 17 Mar 2017 12:12:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751018AbdCQMLx (ORCPT ); Fri, 17 Mar 2017 08:11:53 -0400 Received: from mga01.intel.com ([192.55.52.88]:32901 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751142AbdCQMLu (ORCPT ); Fri, 17 Mar 2017 08:11:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=intel; t=1489752709; x=1521288709; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=nTr250lIHVqjesZsvuZgWxtaN2eHdls7/CcRIEtB37g=; b=DgWwUQF+qFfRJ6xZ4PdKRarkg2xHTVN3XBQ0f6VLzv67PgJdLRcQ19Ma wKa22p4Gm13/1xcEXQFV8dCaDtFlrw==; Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Mar 2017 05:11:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,176,1486454400"; d="scan'208";a="78173761" 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 05:11:36 -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 07/23] net, rds: convert rds_ib_device.refcount from atomic_t to refcount_t Date: Fri, 17 Mar 2017 14:10:30 +0200 Message-Id: <1489752646-8749-8-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/ib.c | 12 ++++++------ net/rds/ib.h | 2 +- net/rds/ib_rdma.c | 4 ++-- 3 files changed, 9 insertions(+), 9 deletions(-) diff --git a/net/rds/ib.c b/net/rds/ib.c index 91fe46f..bb19cda 100644 --- a/net/rds/ib.c +++ b/net/rds/ib.c @@ -118,8 +118,8 @@ static void rds_ib_dev_free(struct work_struct *work) void rds_ib_dev_put(struct rds_ib_device *rds_ibdev) { - BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0); - if (atomic_dec_and_test(&rds_ibdev->refcount)) + BUG_ON(refcount_read(&rds_ibdev->refcount) == 0); + if (refcount_dec_and_test(&rds_ibdev->refcount)) queue_work(rds_wq, &rds_ibdev->free_work); } @@ -137,7 +137,7 @@ static void rds_ib_add_one(struct ib_device *device) return; spin_lock_init(&rds_ibdev->spinlock); - atomic_set(&rds_ibdev->refcount, 1); + refcount_set(&rds_ibdev->refcount, 1); INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); rds_ibdev->max_wrs = device->attrs.max_qp_wr; @@ -205,10 +205,10 @@ static void rds_ib_add_one(struct ib_device *device) down_write(&rds_ib_devices_lock); list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices); up_write(&rds_ib_devices_lock); - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); ib_set_client_data(device, &rds_ib_client, rds_ibdev); - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); rds_ib_nodev_connect(); @@ -239,7 +239,7 @@ struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device) rcu_read_lock(); rds_ibdev = ib_get_client_data(device, &rds_ib_client); if (rds_ibdev) - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); rcu_read_unlock(); return rds_ibdev; } diff --git a/net/rds/ib.h b/net/rds/ib.h index ec55062..bf48224 100644 --- a/net/rds/ib.h +++ b/net/rds/ib.h @@ -230,7 +230,7 @@ struct rds_ib_device { unsigned int max_initiator_depth; unsigned int max_responder_resources; spinlock_t spinlock; /* protect the above */ - atomic_t refcount; + refcount_t refcount; struct work_struct free_work; int *vector_load; }; diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index 977f698..9a3c54e 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -52,7 +52,7 @@ static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr) list_for_each_entry_rcu(rds_ibdev, &rds_ib_devices, list) { list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) { if (i_ipaddr->ipaddr == ipaddr) { - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); rcu_read_unlock(); return rds_ibdev; } @@ -134,7 +134,7 @@ void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *con spin_unlock_irq(&ib_nodev_conns_lock); ic->rds_ibdev = rds_ibdev; - atomic_inc(&rds_ibdev->refcount); + refcount_inc(&rds_ibdev->refcount); } void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn)