From patchwork Thu Feb 24 21:15:57 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: 12759232 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 25F02C433F5 for ; Thu, 24 Feb 2022 21:08:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234539AbiBXVId (ORCPT ); Thu, 24 Feb 2022 16:08:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229542AbiBXVIa (ORCPT ); Thu, 24 Feb 2022 16:08:30 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B791E17E34F; Thu, 24 Feb 2022 13:07:59 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 5220F61977; Thu, 24 Feb 2022 21:07:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6103C340E9; Thu, 24 Feb 2022 21:07:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645736878; bh=a4XhS+Pis5tThTTp0Tl8ZRPRZOit2eEN0Ha7YDcM7So=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=JxdgEIrYXWWucg2uqo7stZ06TKHXbbX/8LjmA4yjpk/eBJCzNr4Eg5dkTibnFI4IE Xlq9peNTRhop9+WYvuaI2BXsDGcvYtSFcCppOw5vvcFQbYnWxAAKunjlfZHk9CkV71 VMUlBcojt1DSzj02iwOeyUFaU0CUp5AZ9EEOKYYj3HVWAc+ffEUE30vfs2IDLE/37/ eI0uYVw1Lm6rzDtGawYy/I0Q0IxrcPNr7f2CC652HqzqDWXOaCURYWE8/VIFsFDAIy k0ocmmlHrO+y793OFt9NUySOJDGBJxPx59zgRpCk1GbW5PRfRuGJxSsg3rgXVWWjfz Hn2j1J/HE3ccg== Date: Thu, 24 Feb 2022 15:15:57 -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 1/6][next] ath6kl: wmi: Replace one-element array with flexible-array member in struct wmi_begin_scan_cmd Message-ID: <1ef801ea24475501fa0f296cb5435a440135206e.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_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 Reviewed-by: Jeff Johnson Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - Add Reviewed-by: Jeff Johnson tag. 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