From patchwork Thu Feb 24 21:16:16 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: 12759233 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 A5A60C433EF for ; Thu, 24 Feb 2022 21:08:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234568AbiBXVIx (ORCPT ); Thu, 24 Feb 2022 16:08:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229542AbiBXVIv (ORCPT ); Thu, 24 Feb 2022 16:08:51 -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 DE38718FACE; Thu, 24 Feb 2022 13:08:20 -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 99F15B829BA; Thu, 24 Feb 2022 21:08:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70918C340E9; Thu, 24 Feb 2022 21:08:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645736898; bh=GgSxQ7JcNCf7iXwHIZ1kVpdtf4ZgVxohv71Xw6IqHns=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=IejOzqjiR5HQke6tO+7QmVutkvmvKXRNIZk+kSQ80ASJxP9o2jxzeu60GvJVtB75f kNZ56dombH4QOB3ZzCraSNKn4zwNuAlMdhojH4Tv8AJDvDlgsidZmeCF/DHetnP7yf 2FBl2bu2EbHe2HVRPoAtTzHo/Aar7HR4v89HyN8iBSba6HpYWwRPHqsgduv3e/TWpV 30WWT1z9GiALFLb64H4gucWKjXxd3ue7CCkm9cKELJgRNnsuindPvuVLEgLEPffECM 0FKOjTN2s5q7koIj7BHm1CljI5y5SZkARJMRdJWlNNxau+FzWkrXXWk2RZv/Pz2xy1 Jb78G42uj2Rng== Date: Thu, 24 Feb 2022 15:16:16 -0600 From: "Gustavo A. R. Silva" To: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Jeff Johnson Cc: Kalle Valo , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, linux-hardening@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH v2 2/6][next] ath6kl: wmi: Replace one-element array with flexible-array member in struct wmi_start_scan_cmd Message-ID: <8b33c6d86a6bd40b5688cf118b4b35850db8d8c7.1645736204.git.gustavoars@kernel.org> 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_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 Reviewed-by: Jeff Johnson --- Changes in v2: - None. 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; /*