From patchwork Wed Feb 23 02:38:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 12756166 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B502EC3525B for ; Wed, 23 Feb 2022 02:33:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237326AbiBWCeB (ORCPT ); Tue, 22 Feb 2022 21:34:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237233AbiBWCcl (ORCPT ); Tue, 22 Feb 2022 21:32:41 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD9DA5A5B8; Tue, 22 Feb 2022 18:30:38 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 51324B81E15; Wed, 23 Feb 2022 02:30:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 563D1C340F1; Wed, 23 Feb 2022 02:30:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645583437; bh=5J/lYOlg+fnmxcJ6RZWQwnyehKvMIl8d1ncoQiQ9fcw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=l5XjhmXsJFytYXELA4i2ZwCcGg+xyPVOUOmnnsbNJQ341mu1a0oVQivPUKHALanHC mpVNPFyLG4OiYCzy8Nf3m8am4Xm+5NCM/Y32QDMo02QsTh5ygKLaJdZK3iv5ikJl9h 68RSNY4/+tfWZ2IIoOCbVxU2a/wdr35rKdHztRXsPeGgTtxP9YwbtKTlEOyHQgE3v2 AzS4tXqV3OeSgLE69yzpYmRC7sOdujBNcVhxVF3b9zpsqm5fl04oGy1E4D+xwmD+nw L05CUHVP7AjL5m7TchcP9uU4Cd0vgWHFVvYh3dmGPnxiJI1Ez3IOSwl2JZd2FEOk+r Jt36jNXVXUPpw== Date: Tue, 22 Feb 2022 20:38:31 -0600 From: "Gustavo A. R. Silva" To: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Kalle Valo , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, linux-hardening@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH 1/6][next] ath6kl: wmi: Replace one-element array with flexible-array member in struct wmi_begin_scan_cmd Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Replace one-element array with flexible-array member in struct wmi_begin_scan_cmd. Also, make use of the struct_size() helper. This issue was found with the help of Coccinelle and audited and fixed, manually. Link: https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays Link: https://github.com/KSPP/linux/issues/79 Signed-off-by: Gustavo A. R. Silva Reviewed-by: Jeff Johnson --- drivers/net/wireless/ath/ath6kl/wmi.c | 9 ++------- drivers/net/wireless/ath/ath6kl/wmi.h | 2 +- 2 files changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c index bd1ef6334997..e1c950014f3e 100644 --- a/drivers/net/wireless/ath/ath6kl/wmi.c +++ b/drivers/net/wireless/ath/ath6kl/wmi.c @@ -2008,7 +2008,7 @@ int ath6kl_wmi_beginscan_cmd(struct wmi *wmi, u8 if_idx, struct ieee80211_supported_band *sband; struct sk_buff *skb; struct wmi_begin_scan_cmd *sc; - s8 size, *supp_rates; + s8 *supp_rates; int i, band, ret; struct ath6kl *ar = wmi->parent_dev; int num_rates; @@ -2023,18 +2023,13 @@ int ath6kl_wmi_beginscan_cmd(struct wmi *wmi, u8 if_idx, num_chan, ch_list); } - size = sizeof(struct wmi_begin_scan_cmd); - if ((scan_type != WMI_LONG_SCAN) && (scan_type != WMI_SHORT_SCAN)) return -EINVAL; if (num_chan > WMI_MAX_CHANNELS) return -EINVAL; - if (num_chan) - size += sizeof(u16) * (num_chan - 1); - - skb = ath6kl_wmi_get_new_buf(size); + skb = ath6kl_wmi_get_new_buf(struct_size(sc, ch_list, num_chan)); if (!skb) return -ENOMEM; diff --git a/drivers/net/wireless/ath/ath6kl/wmi.h b/drivers/net/wireless/ath/ath6kl/wmi.h index 784940ba4c90..322539ed9c12 100644 --- a/drivers/net/wireless/ath/ath6kl/wmi.h +++ b/drivers/net/wireless/ath/ath6kl/wmi.h @@ -863,7 +863,7 @@ struct wmi_begin_scan_cmd { u8 num_ch; /* channels in Mhz */ - __le16 ch_list[1]; + __le16 ch_list[]; } __packed; /* wmi_start_scan_cmd is to be deprecated. Use