From patchwork Tue May 25 23:10:41 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: 12280351 X-Patchwork-Delegate: kuba@kernel.org 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=-21.4 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=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 8B80EC47088 for ; Tue, 25 May 2021 23:09:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E1CE613E1 for ; Tue, 25 May 2021 23:09:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231416AbhEYXLQ (ORCPT ); Tue, 25 May 2021 19:11:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:34814 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229610AbhEYXLP (ORCPT ); Tue, 25 May 2021 19:11:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4D31260698; Tue, 25 May 2021 23:09:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621984185; bh=1IkQtMPV3pvDAz3GCbMK1VEmISi6kSMEwWFVrA8jUo0=; h=Date:From:To:Cc:Subject:From; b=RB5aUqSs5y5a0IPYATmM/7VYF11+WRr09WqC3gEYEA2Q4zJMK8R+YWGQA/PPfP7RB BSJoBgpus6zhTXr3FmYv/nKIH6vUISzRTYbKkAoSIB2m0VVxBi56dZjLJKXJToHg3O EKRL90ryK6eCVEyGBBRWK/iPZ2sXjmYsY+dzMfLXnQZ3eLqLHCwZH1c02tadRCALZB Oq39UvA77qtT48sggJE3dtXCeHmrPyVBeF0/qLTB6FIabYbB+8XdaXPuG1nEQBLnWZ J4TAiAbbA74rCsBZ3WcQS7eO/Qe2cVxvxI88gUJezW3qQoiCpf/O/PYq97VS7Ns+Tm DMS1we9IflxIA== Date: Tue, 25 May 2021 18:10:41 -0500 From: "Gustavo A. R. Silva" To: Jesse Brandeburg , Tony Nguyen , "David S. Miller" , Jakub Kicinski Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH][next] iavf: Replace one-element array in struct virtchnl_tc_info Message-ID: <20210525231041.GA175914@embeddedor> MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@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 virtchnl_tc_info instead of one-element array, and use the flex_array_size() helper. [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 Signed-off-by: Gustavo A. R. Silva --- drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 2 +- include/linux/avf/virtchnl.h | 7 +++---- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c index 123a737f6955..cf2ac577a96f 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c +++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c @@ -1021,7 +1021,7 @@ void iavf_enable_channels(struct iavf_adapter *adapter) return; } - len = struct_size(vti, list, adapter->num_tc - 1); + len = struct_size(vti, list, adapter->num_tc); vti = kzalloc(len, GFP_KERNEL); if (!vti) return; diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h index cda0c98ca978..b554913804bd 100644 --- a/include/linux/avf/virtchnl.h +++ b/include/linux/avf/virtchnl.h @@ -529,10 +529,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_channel_info); struct virtchnl_tc_info { u32 num_tc; u32 pad; - struct virtchnl_channel_info list[1]; + struct virtchnl_channel_info list[]; }; -VIRTCHNL_CHECK_STRUCT_LEN(24, virtchnl_tc_info); +VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_tc_info); /* VIRTCHNL_ADD_CLOUD_FILTER * VIRTCHNL_DEL_CLOUD_FILTER @@ -1106,8 +1106,7 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode, if (msglen >= valid_len) { struct virtchnl_tc_info *vti = (struct virtchnl_tc_info *)msg; - valid_len += (vti->num_tc - 1) * - sizeof(struct virtchnl_channel_info); + valid_len += flex_array_size(vti, list, vti->num_tc); if (vti->num_tc == 0) err_msg_format = true; }