From patchwork Tue May 25 23:09:12 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: 12280349 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 63A04C47087 for ; Tue, 25 May 2021 23:08:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4405B60698 for ; Tue, 25 May 2021 23:08:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231182AbhEYXJq (ORCPT ); Tue, 25 May 2021 19:09:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:34568 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229610AbhEYXJp (ORCPT ); Tue, 25 May 2021 19:09:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DBCEF613E1; Tue, 25 May 2021 23:08:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621984095; bh=P/O96sEoZD/i9afxf4LVHuo7otwPSQxMbZL4rpYOsnM=; h=Date:From:To:Cc:Subject:From; b=VpTdiaER6/Mt8BMGfOi6m/6p6xpatPcWkn9ZthOllaZP3s9o1osewY/uNO+SBjhk7 qZkhmHEhd/UYjCFakdagFCfJbNK+SxLOxfU4ynf+ApkDCkulyKrz4/Rnr8MDz4SaDA lyqc4R12BUWQbxQkImBa+UTbg9sK4SGgixaA5I2N9yMUtgFDeOV6uL0AcRRHrqSFor Va1SFC7AikpbprGY0G6Qa0d9KAWEr6OXqi6kAAntktCtvlXHc3w66ZH9fPThPbA3iU 2XFnkEve0z9grz3WPSiw1QNluFJJ2YeRNoTz7v+ZlYUL5HN895ppdse/nsyMRQi9I6 TK7RrltH1JWQA== Date: Tue, 25 May 2021 18:09:12 -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_lut Message-ID: <20210525230912.GA175802@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_lut 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 6f2a4c8beb0b..123a737f6955 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c +++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c @@ -830,7 +830,7 @@ void iavf_set_rss_key(struct iavf_adapter *adapter) void iavf_set_rss_lut(struct iavf_adapter *adapter) { struct virtchnl_rss_lut *vrl; - int len; + size_t len; if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) { /* bail because we already have a command pending */ @@ -838,8 +838,7 @@ void iavf_set_rss_lut(struct iavf_adapter *adapter) adapter->current_op); return; } - len = sizeof(struct virtchnl_rss_lut) + - (adapter->rss_lut_size * sizeof(u8)) - 1; + len = struct_size(vrl, lut, adapter->rss_lut_size); vrl = kzalloc(len, GFP_KERNEL); if (!vrl) return; diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h index d2fd847a3880..cda0c98ca978 100644 --- a/include/linux/avf/virtchnl.h +++ b/include/linux/avf/virtchnl.h @@ -492,10 +492,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_rss_key); struct virtchnl_rss_lut { u16 vsi_id; u16 lut_entries; - u8 lut[1]; /* RSS lookup table */ + u8 lut[]; /* RSS lookup table */ }; -VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_rss_lut); +VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_rss_lut); /* VIRTCHNL_OP_GET_RSS_HENA_CAPS * VIRTCHNL_OP_SET_RSS_HENA @@ -1087,7 +1087,7 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode, if (msglen >= valid_len) { struct virtchnl_rss_lut *vrl = (struct virtchnl_rss_lut *)msg; - valid_len += vrl->lut_entries - 1; + valid_len += vrl->lut_entries; } break; case VIRTCHNL_OP_GET_RSS_HENA_CAPS: