From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 11589C4727E for ; Wed, 7 Oct 2020 16:04:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2E992173E for ; Wed, 7 Oct 2020 16:04:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602086686; bh=Afpoi0axZ63mSzi9LUVJhYqlciQbhzVpxbkFCpclXHI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=CCk/fFn2MR+NrQ2efBUvenVMB1O+ZARp2RHBZr6EKxCoRogBfUbnsXs6D1ZRPUFm1 3RnEho0WF4w+NB15vWzX9ne3Ft4DMgYb2ty7VwfzEwyxrFysTFqfkSeFBtIoXgjA0S mQcwZSONzwnFtsm2OCsZCKlW4xZE6fJw2Cpn4PeA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729053AbgJGQEp (ORCPT ); Wed, 7 Oct 2020 12:04:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:48172 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728559AbgJGQEp (ORCPT ); Wed, 7 Oct 2020 12:04:45 -0400 Received: from embeddedor (187-162-31-110.static.axtel.net [187.162.31.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 94FC1216C4; Wed, 7 Oct 2020 16:04:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602086683; bh=Afpoi0axZ63mSzi9LUVJhYqlciQbhzVpxbkFCpclXHI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YbEwHOL6kLktQ/Z9t+jJPTlmu8CJwv+nelU6Z5CYjF82+UW5enSegQzU8yTye9H9h 0mJzWw0fPpELJrlwbVjBuqMfGZx7v2T6lewPGPzmoV4V2GdsCjoAeMHzgEPMZoUGJy GF8Ay1rkhrwvdw0MvcRgPGhvWA5pXo+vQKMFlY1o= Date: Wed, 7 Oct 2020 11:10:44 -0500 From: "Gustavo A. R. Silva" To: linux-kernel@vger.kernel.org Cc: linux-hardening@vger.kernel.org, Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , David Airlie , Daniel Vetter , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, "Gustavo A. R. Silva" Subject: [PATCH 13/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_ppt_v1_pcie_table Message-ID: <1f91ef3bc6aeb8adb7362166f09076ddbe13182f.1602020074.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 phm_ppt_v1_pcie_table, instead of a one-element array, and use the struct_size() helper to calculate the size for the allocation. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays Build-tested-by: kernel test robot Link: https://lore.kernel.org/lkml/5f7db0bc.7Xivn4K83f7XW0ug%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva --- .../drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h | 2 +- .../powerplay/hwmgr/process_pptables_v1_0.c | 22 ++++++++----------- .../powerplay/hwmgr/vega10_processpptables.c | 10 +++------ 3 files changed, 13 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h index e11298cdeb30..729615aff126 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h @@ -103,7 +103,7 @@ typedef struct phm_ppt_v1_pcie_record phm_ppt_v1_pcie_record; struct phm_ppt_v1_pcie_table { uint32_t count; /* Number of entries. */ - phm_ppt_v1_pcie_record entries[1]; /* Dynamically allocate count entries. */ + phm_ppt_v1_pcie_record entries[]; /* Dynamically allocate count entries. */ }; typedef struct phm_ppt_v1_pcie_table phm_ppt_v1_pcie_table; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c index 426655b9c678..4fa58614e26a 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c @@ -478,7 +478,7 @@ static int get_pcie_table( PPTable_Generic_SubTable_Header const *ptable ) { - uint32_t table_size, i, pcie_count; + uint32_t i, pcie_count; phm_ppt_v1_pcie_table *pcie_table; struct phm_ppt_v1_information *pp_table_information = (struct phm_ppt_v1_information *)(hwmgr->pptable); @@ -491,12 +491,10 @@ static int get_pcie_table( PP_ASSERT_WITH_CODE((atom_pcie_table->ucNumEntries != 0), "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_pcie_record) * atom_pcie_table->ucNumEntries; - - pcie_table = kzalloc(table_size, GFP_KERNEL); - - if (pcie_table == NULL) + pcie_table = kzalloc(struct_size(pcie_table, entries, + atom_pcie_table->ucNumEntries), + GFP_KERNEL); + if (!pcie_table) return -ENOMEM; /* @@ -530,12 +528,10 @@ static int get_pcie_table( PP_ASSERT_WITH_CODE((atom_pcie_table->ucNumEntries != 0), "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_pcie_record) * atom_pcie_table->ucNumEntries; - - pcie_table = kzalloc(table_size, GFP_KERNEL); - - if (pcie_table == NULL) + pcie_table = kzalloc(struct_size(pcie_table, entries, + atom_pcie_table->ucNumEntries), + GFP_KERNEL); + if (!pcie_table) return -ENOMEM; /* diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c index 3d7f915381c8..535404de78a2 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -784,7 +784,7 @@ static int get_pcie_table(struct pp_hwmgr *hwmgr, struct phm_ppt_v1_pcie_table **vega10_pcie_table, const Vega10_PPTable_Generic_SubTable_Header *table) { - uint32_t table_size, i, pcie_count; + uint32_t i, pcie_count; struct phm_ppt_v1_pcie_table *pcie_table; struct phm_ppt_v2_information *table_info = (struct phm_ppt_v2_information *)(hwmgr->pptable); @@ -795,12 +795,8 @@ static int get_pcie_table(struct pp_hwmgr *hwmgr, "Invalid PowerPlay Table!", return 0); - table_size = sizeof(uint32_t) + - sizeof(struct phm_ppt_v1_pcie_record) * - atom_pcie_table->ucNumEntries; - - pcie_table = kzalloc(table_size, GFP_KERNEL); - + pcie_table = kzalloc(struct_size(pcie_table, entries, atom_pcie_table->ucNumEntries), + GFP_KERNEL); if (!pcie_table) return -ENOMEM; -- 2.27.0