From patchwork Thu Sep 21 07:16:28 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ursula Braun X-Patchwork-Id: 9963411 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 632346056A for ; Thu, 21 Sep 2017 07:17:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 549AD2926F for ; Thu, 21 Sep 2017 07:17:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 495E129295; Thu, 21 Sep 2017 07:17:48 +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 B68E12926F for ; Thu, 21 Sep 2017 07:17:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751881AbdIUHQt (ORCPT ); Thu, 21 Sep 2017 03:16:49 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:41288 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751853AbdIUHQq (ORCPT ); Thu, 21 Sep 2017 03:16:46 -0400 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v8L7FKhF079894 for ; Thu, 21 Sep 2017 03:16:45 -0400 Received: from e06smtp12.uk.ibm.com (e06smtp12.uk.ibm.com [195.75.94.108]) by mx0a-001b2d01.pphosted.com with ESMTP id 2d48cy1b79-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 21 Sep 2017 03:16:45 -0400 Received: from localhost by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 21 Sep 2017 08:16:41 +0100 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v8L7GePc18808866; Thu, 21 Sep 2017 07:16:40 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E321D42041; Thu, 21 Sep 2017 08:12:50 +0100 (BST) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9BCEA4203F; Thu, 21 Sep 2017 08:12:50 +0100 (BST) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Thu, 21 Sep 2017 08:12:50 +0100 (BST) From: Ursula Braun To: davem@davemloft.net Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, jwi@linux.vnet.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, raspl@linux.vnet.ibm.com, ubraun@linux.vnet.ibm.com Subject: [PATCH net 3/9] net/smc: take RCU read lock for routing cache lookup Date: Thu, 21 Sep 2017 09:16:28 +0200 X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170921071634.16883-1-ubraun@linux.vnet.ibm.com> References: <20170921071634.16883-1-ubraun@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17092107-0008-0000-0000-00000498E217 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17092107-0009-0000-0000-00001E2A1BB3 Message-Id: <20170921071634.16883-4-ubraun@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-09-21_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1709210099 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP smc_netinfo_by_tcpsk() looks up the routing cache. Such a lookup requires protection by an RCU read lock. Signed-off-by: Ursula Braun --- net/smc/af_smc.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 8c6d24b2995d..2e8d2dabac0c 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -282,6 +282,7 @@ int smc_netinfo_by_tcpsk(struct socket *clcsock, __be32 *subnet, u8 *prefix_len) { struct dst_entry *dst = sk_dst_get(clcsock->sk); + struct in_device *in_dev; struct sockaddr_in addr; int rc = -ENOENT; int len; @@ -298,14 +299,17 @@ int smc_netinfo_by_tcpsk(struct socket *clcsock, /* get address to which the internal TCP socket is bound */ kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len); /* analyze IPv4 specific data of net_device belonging to TCP socket */ - for_ifa(dst->dev->ip_ptr) { - if (ifa->ifa_address != addr.sin_addr.s_addr) + rcu_read_lock(); + in_dev = __in_dev_get_rcu(dst->dev); + for_ifa(in_dev) { + if (!inet_ifa_match(addr.sin_addr.s_addr, ifa)) continue; *prefix_len = inet_mask_len(ifa->ifa_mask); *subnet = ifa->ifa_address & ifa->ifa_mask; rc = 0; break; - } endfor_ifa(dst->dev->ip_ptr); + } endfor_ifa(in_dev); + rcu_read_unlock(); out_rel: dst_release(dst);