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 81C87C4741F for ; Wed, 7 Oct 2020 15:58:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A75121707 for ; Wed, 7 Oct 2020 15:58:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602086295; bh=HBwtJxagqbtQwZ67Dx8naXj+wlYZpPAKjHhzii40SSg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=blEXvA61ZV/Rg34r8ow+Is+zOpnLWoBZJu4QA42wg65m8fvh1EeQlKuGKcJLM7m1N GQdnPr8VXWchm+5eSJQvE4IYdTrFlUy92158T1WfgLLhuTZKtLL4ghRqkhbpDpWutI Q1emPeaIYuIioeksbvuhpZbWWGK+sT9BLm1Ps/yM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728891AbgJGP6O (ORCPT ); Wed, 7 Oct 2020 11:58:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:43876 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726129AbgJGP6N (ORCPT ); Wed, 7 Oct 2020 11:58:13 -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 8373120789; Wed, 7 Oct 2020 15:58:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602086292; bh=HBwtJxagqbtQwZ67Dx8naXj+wlYZpPAKjHhzii40SSg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sBminQ92WVBJEwwafMT2XaIQUmSq/7wGDo+qB95LHJy0g79ZrIWTtmvjjuIlyhn4Z 9yEtPd43j5BDsGcUzvcwnhQ277O6G/ZPA6BpyL779Q0fsxFTeoCOh2tIXEM+KEnG2t ZL8UqyTHDh3i/CmVF7LUqo+0XVsmt1okRgFdFtqA= Date: Wed, 7 Oct 2020 11:04:12 -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 03/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_clock_array Message-ID: <661ad1c0e07f4eda264c08b219c8c702d67a9531.1602020074.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_clock_array, 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/5f7c433f.ZyMD+YUIVAwiHGVe%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva --- drivers/gpu/drm/amd/pm/inc/hwmgr.h | 2 +- .../amd/pm/powerplay/hwmgr/process_pptables_v1_0.c | 11 ++++------- .../gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c | 7 +++---- .../amd/pm/powerplay/hwmgr/vega10_processpptables.c | 9 +++------ 4 files changed, 11 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index d68b547743e6..e84cff09af2d 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -91,7 +91,7 @@ struct phm_set_power_state_input { struct phm_clock_array { uint32_t count; - uint32_t values[1]; + uint32_t values[]; }; struct phm_clock_voltage_dependency_record { 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 b760f95e7fa7..52188f6cd150 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 @@ -318,19 +318,16 @@ static int get_valid_clk( phm_ppt_v1_clock_voltage_dependency_table const *clk_volt_pp_table ) { - uint32_t table_size, i; + uint32_t i; struct phm_clock_array *table; phm_ppt_v1_clock_voltage_dependency_record *dep_record; PP_ASSERT_WITH_CODE((0 != clk_volt_pp_table->count), "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(uint32_t) * clk_volt_pp_table->count; - - table = kzalloc(table_size, GFP_KERNEL); - - if (NULL == table) + table = kzalloc(struct_size(table, values, clk_volt_pp_table->count), + GFP_KERNEL); + if (!table) return -ENOMEM; table->count = (uint32_t)clk_volt_pp_table->count; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c index d94a7d8e0587..d9bed4df6f65 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -404,12 +404,11 @@ static int get_valid_clk(struct pp_hwmgr *hwmgr, struct phm_clock_array **ptable, const struct phm_clock_voltage_dependency_table *table) { - unsigned long table_size, i; + unsigned long i; struct phm_clock_array *clock_table; - table_size = sizeof(unsigned long) + sizeof(unsigned long) * table->count; - clock_table = kzalloc(table_size, GFP_KERNEL); - if (NULL == clock_table) + clock_table = kzalloc(struct_size(clock_table, values, table->count), GFP_KERNEL); + if (!clock_table) return -ENOMEM; clock_table->count = (unsigned long)table->count; 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 f29af5ca0aa0..e655c04ccdfb 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -875,17 +875,14 @@ static int get_valid_clk( struct phm_clock_array **clk_table, const phm_ppt_v1_clock_voltage_dependency_table *clk_volt_pp_table) { - uint32_t table_size, i; + uint32_t i; struct phm_clock_array *table; PP_ASSERT_WITH_CODE(clk_volt_pp_table->count, "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(uint32_t) * clk_volt_pp_table->count; - - table = kzalloc(table_size, GFP_KERNEL); - + table = kzalloc(struct_size(table, values, clk_volt_pp_table->count), + GFP_KERNEL); if (!table) return -ENOMEM; -- 2.27.0