From patchwork Wed Nov 18 13:13:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 327754 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B17FC63697 for ; Wed, 18 Nov 2020 13:14:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DCA0820829 for ; Wed, 18 Nov 2020 13:14:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726251AbgKRNNt (ORCPT ); Wed, 18 Nov 2020 08:13:49 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:57997 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725772AbgKRNNt (ORCPT ); Wed, 18 Nov 2020 08:13:49 -0500 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1kfNHN-0001Bz-Bc; Wed, 18 Nov 2020 13:13:45 +0000 From: Colin King To: James Smart , Dick Kennedy , "James E . J . Bottomley" , "Martin K . Petersen" , linux-scsi@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][next] scsi: lpfc: fix pointer defereference before it is null checked issue Date: Wed, 18 Nov 2020 13:13:45 +0000 Message-Id: <20201118131345.460631-1-colin.king@canonical.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Colin Ian King There is a null check on pointer lpfc_cmd after the pointer has been dereferenced when pointers rdata and ndlp are initialized at the start of the function. Fix this by only assigning rdata and ndlp after the pointer lpfc_cmd has been null checked. Addresses-Coverity: ("Dereference before null check") Fixes: 96e209be6ecb ("scsi: lpfc: Convert SCSI I/O completions to SLI-3 and SLI-4 handlers") Signed-off-by: Colin Ian King Reviewed-by: James Smart --- drivers/scsi/lpfc/lpfc_scsi.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index f989490359a5..3b989f720937 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -4022,8 +4022,8 @@ lpfc_fcp_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn, struct lpfc_io_buf *lpfc_cmd = (struct lpfc_io_buf *)pwqeIn->context1; struct lpfc_vport *vport = pwqeIn->vport; - struct lpfc_rport_data *rdata = lpfc_cmd->rdata; - struct lpfc_nodelist *ndlp = rdata->pnode; + struct lpfc_rport_data *rdata; + struct lpfc_nodelist *ndlp; struct scsi_cmnd *cmd; unsigned long flags; struct lpfc_fast_path_event *fast_path_evt; @@ -4040,6 +4040,9 @@ lpfc_fcp_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn, return; } + rdata = lpfc_cmd->rdata; + ndlp = rdata->pnode; + if (bf_get(lpfc_wcqe_c_xb, wcqe)) { /* TOREMOVE - currently this flag is checked during * the release of lpfc_iocbq. Remove once we move