From patchwork Thu Jun 20 13:50:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 11006703 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3145714B6 for ; Thu, 20 Jun 2019 13:51:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 22C4E2876C for ; Thu, 20 Jun 2019 13:51:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 176662876D; Thu, 20 Jun 2019 13:51:04 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 B755E2877F for ; Thu, 20 Jun 2019 13:51:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727144AbfFTNu6 (ORCPT ); Thu, 20 Jun 2019 09:50:58 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:57928 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726654AbfFTNu6 (ORCPT ); Thu, 20 Jun 2019 09:50:58 -0400 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1hdxSn-0005dA-1a; Thu, 20 Jun 2019 13:50:53 +0000 From: Colin King To: Doug Ledford , Jason Gunthorpe , Leon Romanovsky , Parav Pandit , linux-rdma@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][next] RDMA: check for null return from call to ib_get_client_data Date: Thu, 20 Jun 2019 14:50:52 +0100 Message-Id: <20190620135052.27367-1-colin.king@canonical.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 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 From: Colin Ian King The return from ib_get_client_data can potentially be null, so add a null check on umad_dev and return -ENODEV in this unlikely case to avoid any null pointer deferences. Addresses-Coverity: ("Dereference null return") Fixes: 8f71bb0030b8 ("RDMA: Report available cdevs through RDMA_NLDEV_CMD_GET_CHARDEV") Signed-off-by: Colin Ian King --- drivers/infiniband/core/user_mad.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c index 547090b41cfb..d78a35913824 100644 --- a/drivers/infiniband/core/user_mad.c +++ b/drivers/infiniband/core/user_mad.c @@ -1153,6 +1153,9 @@ static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data, struct ib_umad_device *umad_dev = ib_get_client_data(ibdev, &umad_client); + if (!umad_dev) + return -ENODEV; + if (!rdma_is_port_valid(ibdev, res->port)) return -EINVAL;