From patchwork Wed Feb 23 02:38:41 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: 12756159 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55407C433EF for ; Wed, 23 Feb 2022 02:33:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237270AbiBWCdz (ORCPT ); Tue, 22 Feb 2022 21:33:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237335AbiBWCc5 (ORCPT ); Tue, 22 Feb 2022 21:32:57 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA73A5838B; Tue, 22 Feb 2022 18:30:49 -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 30C81B81E0D; Wed, 23 Feb 2022 02:30:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40669C340F1; Wed, 23 Feb 2022 02:30:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645583447; bh=84NzthgNnggRukjxvstPsXLf6qk4EW6yOe7lHrtHxx0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=TWv0ro/9xn6xSlMZJgb4RV1cw3oqjLzuCs6xkxP9G/AvZ7cHpd42u+8dGcuJQ1oDF Vx78JVqr0lNfeSew2fveDUP+7d29/zLve+3tEcqzoS/hFnX/j1vqm5756VmLxMUhXB mzZjAFuUEcqAFVj9I7QRNSSH+hfdxqGOKlbnY4enCBg07/QZEuee3fUQO0X7vsLtfT uPYq1k0mNK95F0G9oLPPFSiV153zxjY5pF16rKBANM/ZvzWb6pI9pY4HQgiFl4mer0 PEowR1PrAX852KxMR9wmV9zFhhKNhY5/93BNkWW/KhJ0Dhdko7DnqGGY2fntZiZk6B 6ERGLGdcgPy1A== Date: Tue, 22 Feb 2022 20:38:41 -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 2/6][next] ath6kl: wmi: Replace one-element array with flexible-array member in struct wmi_start_scan_cmd Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Replace one-element array with flexible-array member in struct wmi_start_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 --- drivers/net/wireless/ath/ath6kl/wmi.c | 8 +------- drivers/net/wireless/ath/ath6kl/wmi.h | 2 +- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c index e1c950014f3e..bdfc057c5a82 100644 --- a/drivers/net/wireless/ath/ath6kl/wmi.c +++ b/drivers/net/wireless/ath/ath6kl/wmi.c @@ -1959,21 +1959,15 @@ static int ath6kl_wmi_startscan_cmd(struct wmi *wmi, u8 if_idx, { struct sk_buff *skb; struct wmi_start_scan_cmd *sc; - s8 size; int i, ret; - size = sizeof(struct wmi_start_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 322539ed9c12..9e168752bec2 100644 --- a/drivers/net/wireless/ath/ath6kl/wmi.h +++ b/drivers/net/wireless/ath/ath6kl/wmi.h @@ -889,7 +889,7 @@ struct wmi_start_scan_cmd { u8 num_ch; /* channels in Mhz */ - __le16 ch_list[1]; + __le16 ch_list[]; } __packed; /*