From patchwork Tue May 25 23:18:51 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: 12280355 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 CF1F6C47087 for ; Tue, 25 May 2021 23:17:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B04F7613E6 for ; Tue, 25 May 2021 23:17:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231423AbhEYXTZ (ORCPT ); Tue, 25 May 2021 19:19:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:36776 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230145AbhEYXTY (ORCPT ); Tue, 25 May 2021 19:19:24 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B5DE86128B; Tue, 25 May 2021 23:17:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621984674; bh=bJ4XAZH21tHtmuVTr98seVj7Q79bHvG/8rOCPJR+Jr4=; h=Date:From:To:Cc:Subject:From; b=bi8dANLjd9cpoUMHMwE1r58G5yZizrELQGJ3PmqOwl9TzPAWFGovmDwLHbhMOwrvW nLJvPSVdgAgXTXLIJ1B64RIdXbG1JAZbDyog61i+05nfGWtXA7FxgYv8jCIPKN3gAq zZ7tUuhW7d2a/EvDqQN4j6Aq9E5c2iL3SAvYSAtLyzSBlqHmxK7XDMqWBJ7ESnN2CS 5NrK+F6zvFdnKBRYj61dkLLjcuMWPodJCkd21aJvNJor3j//wHZBL/VSKA2TkCFoQ4 UOQB8OVfBwyR6LUQRFamAwU7cChB/Ax8GDm3pwp/hCE9wl5OxZpCreIrQnn+zQ+xlh Kh25vmgaMDGjg== Date: Tue, 25 May 2021 18:18:51 -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_rss_key Message-ID: <20210525231851.GA176647@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_rss_key instead of one-element array, and use the struct_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 | 5 ++--- include/linux/avf/virtchnl.h | 6 +++--- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c index 167955094170..6f2a4c8beb0b 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c +++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c @@ -799,7 +799,7 @@ void iavf_set_hena(struct iavf_adapter *adapter) void iavf_set_rss_key(struct iavf_adapter *adapter) { struct virtchnl_rss_key *vrk; - int len; + size_t len; if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) { /* bail because we already have a command pending */ @@ -807,8 +807,7 @@ void iavf_set_rss_key(struct iavf_adapter *adapter) adapter->current_op); return; } - len = sizeof(struct virtchnl_rss_key) + - (adapter->rss_key_size * sizeof(u8)) - 1; + len = struct_size(vrk, key, adapter->rss_key_size); vrk = kzalloc(len, GFP_KERNEL); if (!vrk) return; diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h index 9b9d79c270b1..d2fd847a3880 100644 --- a/include/linux/avf/virtchnl.h +++ b/include/linux/avf/virtchnl.h @@ -484,10 +484,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_promisc_info); struct virtchnl_rss_key { u16 vsi_id; u16 key_len; - u8 key[1]; /* RSS hash key, packed bytes */ + u8 key[]; /* RSS hash key, packed bytes */ }; -VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_rss_key); +VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_rss_key); struct virtchnl_rss_lut { u16 vsi_id; @@ -1079,7 +1079,7 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode, if (msglen >= valid_len) { struct virtchnl_rss_key *vrk = (struct virtchnl_rss_key *)msg; - valid_len += vrk->key_len - 1; + valid_len += vrk->key_len; } break; case VIRTCHNL_OP_CONFIG_RSS_LUT: