From patchwork Thu Sep 22 16:53:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 608539 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD657C6FA82 for ; Thu, 22 Sep 2022 16:53:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231616AbiIVQxg (ORCPT ); Thu, 22 Sep 2022 12:53:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231614AbiIVQxc (ORCPT ); Thu, 22 Sep 2022 12:53:32 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 560C2EB124; Thu, 22 Sep 2022 09:53:31 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 08DB4B83916; Thu, 22 Sep 2022 16:53:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 265F7C433D6; Thu, 22 Sep 2022 16:53:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1663865608; bh=Tb8Ym6SKz0DJBU5P9QYR//IAXv6Q6jQSGIGCbpUCXyY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=rV/iE1vfsm1ImiHzuXh7DCL9kB78ZiP71qIOnppVKd+fnxdrlpVnkcDC3nGt53YL2 hh0tEEFw18AJEMfMAJEghWWU1AwgN9kg1O2B8KQM896qmeahg4IVSdYVYRH5QtnNew O5q1LS2PnVhjZAu8nxvT7zEIVE2hq1RBFu1ci45HFaRu4bFd2gcmYbI4B93GLs9vLr PoD9AqtwGziH+cJlorgn2IQzjTzBzknNc74C4itROgN8Urwo2SY6A9GRg28S991U3A N/W/oC4aEITNJ/MhSDIrmYc/i1IQxZfiSeGGBC3EQQTMv2afY+9YpzGjCH8Wpr8pF3 Vnt1FaTUcBd9w== Date: Thu, 22 Sep 2022 11:53:23 -0500 From: "Gustavo A. R. Silva" To: HighPoint Linux Team , "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH 1/2][next] scsi: hptiop: Replace one-element array with flexible-array member Message-ID: <6238ccf37798e36d783f5ce5e483e6837e98be79.1663865333.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org One-element arrays are deprecated, and we are replacing them with flexible array members instead. So, replace one-element array with flexible-array member in struct hpt_iop_request_scsi_command and refactor the rest of the code, accordingly. The following pieces of code suggest that the one element of array sg_list in struct hpt_iop_request_scsi_command is not taken into account when calculating the total size for both struct hpt_iop_request_scsi_command and the maximum number of elements sg_list will contain: 1047 req->header.size = cpu_to_le32( 1048 sizeof(struct hpt_iop_request_scsi_command) 1049 - sizeof(struct hpt_iopsg) 1050 + sg_count * sizeof(struct hpt_iopsg)); 1400 req_size = sizeof(struct hpt_iop_request_scsi_command) 1401 + sizeof(struct hpt_iopsg) * (hba->max_sg_descriptors - 1); So it's safe to replace the one-element array with a flexible-array member and update the code above, accordingly: now we don't need to subtract sizeof(struct hpt_iopsg) from sizeof(struct hpt_iop_request_scsi_command) because this is implicitly done by the flex-array transformation. Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/205 Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook --- drivers/scsi/hptiop.c | 3 +-- drivers/scsi/hptiop.h | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c index f18b770626e6..cfc6546e35a6 100644 --- a/drivers/scsi/hptiop.c +++ b/drivers/scsi/hptiop.c @@ -1046,7 +1046,6 @@ static int hptiop_queuecommand_lck(struct scsi_cmnd *scp) req->lun = scp->device->lun; req->header.size = cpu_to_le32( sizeof(struct hpt_iop_request_scsi_command) - - sizeof(struct hpt_iopsg) + sg_count * sizeof(struct hpt_iopsg)); memcpy(req->cdb, scp->cmnd, sizeof(req->cdb)); @@ -1398,7 +1397,7 @@ static int hptiop_probe(struct pci_dev *pcidev, const struct pci_device_id *id) host->max_cmd_len = 16; req_size = sizeof(struct hpt_iop_request_scsi_command) - + sizeof(struct hpt_iopsg) * (hba->max_sg_descriptors - 1); + + sizeof(struct hpt_iopsg) * hba->max_sg_descriptors; if ((req_size & 0x1f) != 0) req_size = (req_size + 0x1f) & ~0x1f; diff --git a/drivers/scsi/hptiop.h b/drivers/scsi/hptiop.h index 363d5a16243f..ef2f2aca598c 100644 --- a/drivers/scsi/hptiop.h +++ b/drivers/scsi/hptiop.h @@ -228,7 +228,7 @@ struct hpt_iop_request_scsi_command { u8 pad1; u8 cdb[16]; __le32 dataxfer_length; - struct hpt_iopsg sg_list[1]; + struct hpt_iopsg sg_list[]; }; struct hpt_iop_request_ioctl_command {