From patchwork Tue Aug 10 21:07:41 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: 495541 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, URIBL_BLOCKED autolearn=ham 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 73AEBC4320A for ; Tue, 10 Aug 2021 21:05:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 53AFB60FDA for ; Tue, 10 Aug 2021 21:05:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233460AbhHJVFY (ORCPT ); Tue, 10 Aug 2021 17:05:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:57706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232739AbhHJVFN (ORCPT ); Tue, 10 Aug 2021 17:05:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 216AE60E09; Tue, 10 Aug 2021 21:04:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628629490; bh=C9XBDAJhXG+Rn8ZoatuMyt7pr8cmprWx13pjHSQveVo=; h=Date:From:To:Cc:Subject:From; b=I/wE/F/TPJo5nPASsKpzfqi6kRfsDyGVgwUvtu1SNYrjx3u0uWGF+5cFyVO+Iw7FL Zpz81Q6hMJ2ibs+nDTDxkw1UAFH4axgXqvsKMrUMthjbaFnebPEHj3z0Di5SZms8MP tbxcmiuDAkHGZqdhEOF7rMWh08625ku6s57Faytx+g2rGlsXmxP2Dn6oeHS51lkHqf iA8NsoRbEVlVuujpP2AB65KdQDSdcIJhoDTKkbIgB6xlDkF73dYN051gb88d4EiUi/ Dm2buvPvfrwStr0QbMdcWmowzMf/g5D17cvI/0DbvZUzHlI8rHUEGeN85oPrK1fs3z ZV6gMDhC2g0OQ== Date: Tue, 10 Aug 2021 16:07:41 -0500 From: "Gustavo A. R. Silva" To: Don Brace , "James E.J. Bottomley" , "Martin K. Petersen" Cc: storagedev@microchip.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH][next] scsi: smartpqi: Replace one-element array with flexible-array member Message-ID: <20210810210741.GA58765@embeddedor> MIME-Version: 1.0 Content-Disposition: inline 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 a bit according to the use of a flexible-array member in struct pqi_event_config instead of a 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(). This issue was found with the help of Coccinelle and audited and fixed, manually. [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 --- drivers/scsi/smartpqi/smartpqi.h | 2 +- drivers/scsi/smartpqi/smartpqi_init.c | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h index f340afc011b5..70eca203d72f 100644 --- a/drivers/scsi/smartpqi/smartpqi.h +++ b/drivers/scsi/smartpqi/smartpqi.h @@ -415,7 +415,7 @@ struct pqi_event_config { u8 reserved[2]; u8 num_event_descriptors; u8 reserved1; - struct pqi_event_descriptor descriptors[1]; + struct pqi_event_descriptor descriptors[]; }; #define PQI_MAX_EVENT_DESCRIPTORS 255 diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c index c1f0f8da9fe2..f9107127bd6e 100644 --- a/drivers/scsi/smartpqi/smartpqi_init.c +++ b/drivers/scsi/smartpqi/smartpqi_init.c @@ -4740,8 +4740,7 @@ static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info) } #define PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH \ - (offsetof(struct pqi_event_config, descriptors) + \ - (PQI_MAX_EVENT_DESCRIPTORS * sizeof(struct pqi_event_descriptor))) + struct_size((struct pqi_event_config *)0, descriptors, PQI_MAX_EVENT_DESCRIPTORS) static int pqi_configure_events(struct pqi_ctrl_info *ctrl_info, bool enable_events)