From patchwork Fri Sep 8 15:24:52 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 9944509 X-Patchwork-Delegate: kvalo@adurom.com 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 E35C5604D4 for ; Fri, 8 Sep 2017 15:25:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E01F9287BF for ; Fri, 8 Sep 2017 15:25:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D4C46287EC; Fri, 8 Sep 2017 15:25:14 +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=-6.9 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 5C478287E6 for ; Fri, 8 Sep 2017 15:25:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756510AbdIHPY7 (ORCPT ); Fri, 8 Sep 2017 11:24:59 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:32836 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755043AbdIHPY5 (ORCPT ); Fri, 8 Sep 2017 11:24:57 -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 1dqL9I-0001pi-Mk; Fri, 08 Sep 2017 15:24:52 +0000 From: Colin King To: Kalle Valo , Amitkumar Karwar , Prameela Rani Garnepudi , Karun Eagalapati , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] rsi: fix a dereference on adapter before it has been null checked Date: Fri, 8 Sep 2017 16:24:52 +0100 Message-Id: <20170908152452.3594-1-colin.king@canonical.com> X-Mailer: git-send-email 2.14.1 MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Colin Ian King The assignment of dev is dereferencing adapter before adapter has been null checked, potentially leading to a null pointer dereference. Fix this by simply moving the assignment of dev to a later point after the sanity null check of adapter. Detected by CoverityScan CID#1398383 ("Dereference before null check") Fixes: dad0d04fa7ba ("rsi: Add RS9113 wireless driver") Signed-off-by: Colin Ian King --- drivers/net/wireless/rsi/rsi_91x_usb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c b/drivers/net/wireless/rsi/rsi_91x_usb.c index 81df09dd2636..08730227cd18 100644 --- a/drivers/net/wireless/rsi/rsi_91x_usb.c +++ b/drivers/net/wireless/rsi/rsi_91x_usb.c @@ -73,8 +73,7 @@ static int rsi_write_multiple(struct rsi_hw *adapter, u8 *data, u32 count) { - struct rsi_91x_usbdev *dev = - (struct rsi_91x_usbdev *)adapter->rsi_dev; + struct rsi_91x_usbdev *dev; if (!adapter) return -ENODEV; @@ -82,6 +81,7 @@ static int rsi_write_multiple(struct rsi_hw *adapter, if (endpoint == 0) return -EINVAL; + dev = (struct rsi_91x_usbdev *)adapter->rsi_dev; if (dev->write_fail) return -ENETDOWN;