From patchwork Tue Jul 28 13:54:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winkler, Tomas" X-Patchwork-Id: 6886271 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E78CFC05AC for ; Tue, 28 Jul 2015 13:58:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2E3F42063B for ; Tue, 28 Jul 2015 13:58:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3E89120636 for ; Tue, 28 Jul 2015 13:58:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755629AbbG1N62 (ORCPT ); Tue, 28 Jul 2015 09:58:28 -0400 Received: from mga09.intel.com ([134.134.136.24]:37064 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932250AbbG1N5f (ORCPT ); Tue, 28 Jul 2015 09:57:35 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP; 28 Jul 2015 06:55:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,563,1432623600"; d="scan'208";a="737128542" Received: from twinkler-dhg.jer.intel.com ([10.12.87.84]) by orsmga001.jf.intel.com with ESMTP; 28 Jul 2015 06:55:43 -0700 From: Tomas Winkler To: James Bottomley Cc: Christoph Hellwig , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Tomas Winkler , Douglas Gilbert Subject: [scsi 5/7 RESEND] scsi_debug: schedule_resp fix input variable check Date: Tue, 28 Jul 2015 16:54:24 +0300 Message-Id: <1438091666-18113-5-git-send-email-tomas.winkler@intel.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1438091666-18113-1-git-send-email-tomas.winkler@intel.com> References: <1438091666-18113-1-git-send-email-tomas.winkler@intel.com> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The function should never be called with cmnd NULL so put a fat WARN there. Fix also smatch wraning: schedule_resp() warn: variable dereferenced before check 'cmnd' Cc: Douglas Gilbert Signed-off-by: Tomas Winkler Acked-by: Douglas Gilbert Reviewed-by: Martin K. Petersen --- drivers/scsi/scsi_debug.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 3a70683cf9f9..faa4ddd8decf 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -3941,13 +3941,20 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, unsigned long iflags; int k, num_in_q, qdepth, inject; struct sdebug_queued_cmd *sqcp = NULL; - struct scsi_device *sdp = cmnd->device; + struct scsi_device *sdp; + + /* this should never happen */ + if (WARN_ON(!cmnd)) + return SCSI_MLQUEUE_HOST_BUSY; - if (NULL == cmnd || NULL == devip) { - pr_warn("called with NULL cmnd or devip pointer\n"); + if (NULL == devip) { + pr_warn("called devip == NULL\n"); /* no particularly good error to report back */ return SCSI_MLQUEUE_HOST_BUSY; } + + sdp = cmnd->device; + if ((scsi_result) && (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n", __func__, scsi_result);