From patchwork Thu Aug 5 04:18:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 12420261 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=-21.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 2AAF7C4320A for ; Thu, 5 Aug 2021 04:15:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E39761073 for ; Thu, 5 Aug 2021 04:15:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235877AbhHEEPk (ORCPT ); Thu, 5 Aug 2021 00:15:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:57236 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230215AbhHEEPk (ORCPT ); Thu, 5 Aug 2021 00:15:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E389861008; Thu, 5 Aug 2021 04:15:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628136926; bh=sKYzfoQnOauHaBevSJJ+01Qcw+1Iy/ZwKyQRsQ9BISE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NZz4wI/AMUyESr4eJ7QZZ8JVYq1lIkjE09UZrX92uyKsLqw2iqL8U6UsKXwbX0G1l Cf7B97aXb3hVsOh/gfUnFz3LPbueDbR0AaH7GoYvbV8WY8P3qXBxsaiSi3SaXRaChF jqiJ4PXVm+chC8rS5AUCqW/CfWRCPJBYbJ07bEPycCv2owwtx5ESZmBOtnwt9CDqLr vJfM+W3cPNd+niILrjVQ6sZg9nlUXV9tpwSBsfpghkKOAQDUixGaHexuLzKFB3vcmn eXdHE9yP1ecuFqsc/qS6H7D+dWdjkL3noZKjjr+89FXOuqkmpsBK6pt43qlxtKAaLL tR+jab5EVLPWw== Date: Wed, 4 Aug 2021 23:18:07 -0500 From: "Gustavo A. R. Silva" To: linux-kernel@vger.kernel.org Cc: Kashyap Desai , Sumit Saxena , Shivasharan S , "James E.J. Bottomley" , "Martin K. Petersen" , megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, linux-hardening@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH v2 1/4][next] scsi: megaraid_sas: Replace one-element array with flexible-array member in MR_FW_RAID_MAP Message-ID: <8f32956f8e1699cd78231fd49a3a333b8fa11546.1628136510.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 There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. Refactor the code according to the use of a flexible-array member in struct MR_FW_RAID_MAP instead of one-element array, and use the struct_size() helper. This helps with the ongoing efforts to globally enable -Warray-bounds and get us closer to being able to tighten the FORTIFY_SOURCE routines on memcpy(). [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/109 Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - Revert changes in struct MR_FW_RAID_MAP_ALL. - Update Subject line and changelog text. drivers/scsi/megaraid/megaraid_sas_base.c | 6 +++--- drivers/scsi/megaraid/megaraid_sas_fp.c | 6 +++--- drivers/scsi/megaraid/megaraid_sas_fusion.h | 2 +- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index ec10b2497310..d072f9caeb4a 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -5147,9 +5147,9 @@ static void megasas_update_ext_vd_details(struct megasas_instance *instance) fusion->current_map_sz = ventura_map_sz; fusion->max_map_sz = ventura_map_sz; } else { - fusion->old_map_sz = sizeof(struct MR_FW_RAID_MAP) + - (sizeof(struct MR_LD_SPAN_MAP) * - (instance->fw_supported_vd_count - 1)); + fusion->old_map_sz = + struct_size((struct MR_FW_RAID_MAP *)0, ldSpanMap, + instance->fw_supported_vd_count); fusion->new_map_sz = sizeof(struct MR_FW_RAID_MAP_EXT); fusion->max_map_sz = diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c index 83f69c33b01a..da1cad1ee123 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fp.c +++ b/drivers/scsi/megaraid/megaraid_sas_fp.c @@ -326,9 +326,9 @@ u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id) else if (instance->supportmax256vd) expected_size = sizeof(struct MR_FW_RAID_MAP_EXT); else - expected_size = - (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) + - (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount))); + expected_size = struct_size((struct MR_FW_RAID_MAP *)0, + ldSpanMap, + le16_to_cpu(pDrvRaidMap->ldCount)); if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) { dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x", diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h index ce84f811e5e1..a47139ef9ee2 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.h +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h @@ -942,7 +942,7 @@ struct MR_FW_RAID_MAP { u8 reserved2[7]; struct MR_ARRAY_INFO arMapInfo[MAX_RAIDMAP_ARRAYS]; struct MR_DEV_HANDLE_INFO devHndlInfo[MAX_RAIDMAP_PHYSICAL_DEVICES]; - struct MR_LD_SPAN_MAP ldSpanMap[1]; + struct MR_LD_SPAN_MAP ldSpanMap[]; }; struct IO_REQUEST_INFO {