From patchwork Tue Feb 25 00:34:08 2020 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: 216424 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=-13.1 required=3.0 tests=DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_SANE_1 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 5618BC35DEA for ; Tue, 25 Feb 2020 00:53:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1F89B20838 for ; Tue, 25 Feb 2020 00:53:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="sh51uhl5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728671AbgBYAxc (ORCPT ); Mon, 24 Feb 2020 19:53:32 -0500 Received: from gateway36.websitewelcome.com ([192.185.196.23]:46933 "EHLO gateway36.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727696AbgBYAxc (ORCPT ); Mon, 24 Feb 2020 19:53:32 -0500 X-Greylist: delayed 1321 seconds by postgrey-1.27 at vger.kernel.org; Mon, 24 Feb 2020 19:53:31 EST Received: from cm16.websitewelcome.com (cm16.websitewelcome.com [100.42.49.19]) by gateway36.websitewelcome.com (Postfix) with ESMTP id 709BA400CA6FE for ; Mon, 24 Feb 2020 17:46:13 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 6O8Hjbw5H8vkB6O8HjXPhh; Mon, 24 Feb 2020 18:31:29 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Type:MIME-Version:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=+57+TZ+YS4fZoiEVbZiT3ANzLG4Ir1hQoUxGBfOF4M4=; b=sh51uhl5baRoJtHSTmrspjD2QJ Ru1DDAERaQUgtBRxZld32WPyJwVT46uq1l+8Dm7ktFw8/+cR+HBNcpQqTrmfxn/I7t8b/mXhyebJh gHHyc1h5/ES31UlOe69t8dHj7i/t766pPjoJY2KCBztNdeP5FMnuGwWJBon6cuWTa6vl0t2xkGhb3 VHzUpTqGZNbl8aF9+WAYd83VcHLdE71nAgWU6i6cs57sVllG1ntZZay8LOLuE6mz2ccNZ47wjYEbZ EVVIFs/ZL+DpxGZcMFGxs1buz+JD2OegK3gY2/nautdm4Pg8ePmI1I8vKKNe7mSzWqzDCbaBQl6i+ rFBfrZIw==; Received: from [201.166.191.211] (port=54920 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j6O8F-002YvY-IY; Mon, 24 Feb 2020 18:31:27 -0600 Date: Mon, 24 Feb 2020 18:34:08 -0600 From: "Gustavo A. R. Silva" To: Kalle Valo , "David S. Miller" Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH][next] wireless: ti: Replace zero-length array with flexible-array member Message-ID: <20200225003408.GA28675@embeddedor> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 201.166.191.211 X-Source-L: No X-Exim-ID: 1j6O8F-002YvY-IY X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [201.166.191.211]:54920 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 43 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva --- drivers/net/wireless/ti/wl1251/cmd.h | 4 ++-- drivers/net/wireless/ti/wl1251/wl12xx_80211.h | 2 +- drivers/net/wireless/ti/wlcore/acx.h | 2 +- drivers/net/wireless/ti/wlcore/boot.h | 2 +- drivers/net/wireless/ti/wlcore/cmd.h | 2 +- drivers/net/wireless/ti/wlcore/conf.h | 2 +- drivers/net/wireless/ti/wlcore/wl12xx_80211.h | 2 +- 7 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/ti/wl1251/cmd.h b/drivers/net/wireless/ti/wl1251/cmd.h index 1c1a591c6055..e5874186f9d7 100644 --- a/drivers/net/wireless/ti/wl1251/cmd.h +++ b/drivers/net/wireless/ti/wl1251/cmd.h @@ -90,7 +90,7 @@ struct wl1251_cmd_header { u16 id; u16 status; /* payload */ - u8 data[0]; + u8 data[]; } __packed; struct wl1251_command { @@ -281,7 +281,7 @@ struct wl1251_cmd_packet_template { struct wl1251_cmd_header header; __le16 size; - u8 data[0]; + u8 data[]; } __packed; #define TIM_ELE_ID 5 diff --git a/drivers/net/wireless/ti/wl1251/wl12xx_80211.h b/drivers/net/wireless/ti/wl1251/wl12xx_80211.h index 7fabe702c4cc..7e28fe435b43 100644 --- a/drivers/net/wireless/ti/wl1251/wl12xx_80211.h +++ b/drivers/net/wireless/ti/wl1251/wl12xx_80211.h @@ -65,7 +65,7 @@ struct ieee80211_header { u8 sa[ETH_ALEN]; u8 bssid[ETH_ALEN]; __le16 seq_ctl; - u8 payload[0]; + u8 payload[]; } __packed; struct wl12xx_ie_header { diff --git a/drivers/net/wireless/ti/wlcore/acx.h b/drivers/net/wireless/ti/wlcore/acx.h index a265fba0cb4c..c725f5855c13 100644 --- a/drivers/net/wireless/ti/wlcore/acx.h +++ b/drivers/net/wireless/ti/wlcore/acx.h @@ -938,7 +938,7 @@ struct acx_rx_filter_cfg { u8 action; u8 num_fields; - u8 fields[0]; + u8 fields[]; } __packed; struct acx_roaming_stats { diff --git a/drivers/net/wireless/ti/wlcore/boot.h b/drivers/net/wireless/ti/wlcore/boot.h index 14b367e98dce..24a2dfcb41ea 100644 --- a/drivers/net/wireless/ti/wlcore/boot.h +++ b/drivers/net/wireless/ti/wlcore/boot.h @@ -26,7 +26,7 @@ struct wl1271_static_data { u8 fw_version[WL1271_FW_VERSION_MAX_LEN]; u32 hw_version; u8 tx_power_table[WL1271_NO_SUBBANDS][WL1271_NO_POWER_LEVELS]; - u8 priv[0]; + u8 priv[]; }; /* number of times we try to read the INIT interrupt */ diff --git a/drivers/net/wireless/ti/wlcore/cmd.h b/drivers/net/wireless/ti/wlcore/cmd.h index bfad7b5a1ac6..f2609d5b6bf7 100644 --- a/drivers/net/wireless/ti/wlcore/cmd.h +++ b/drivers/net/wireless/ti/wlcore/cmd.h @@ -209,7 +209,7 @@ struct wl1271_cmd_header { __le16 id; __le16 status; /* payload */ - u8 data[0]; + u8 data[]; } __packed; #define WL1271_CMD_MAX_PARAMS 572 diff --git a/drivers/net/wireless/ti/wlcore/conf.h b/drivers/net/wireless/ti/wlcore/conf.h index 6116383ee248..31be425f2332 100644 --- a/drivers/net/wireless/ti/wlcore/conf.h +++ b/drivers/net/wireless/ti/wlcore/conf.h @@ -1150,7 +1150,7 @@ struct wlcore_conf { struct wlcore_conf_file { struct wlcore_conf_header header; struct wlcore_conf core; - u8 priv[0]; + u8 priv[]; } __packed; #endif diff --git a/drivers/net/wireless/ti/wlcore/wl12xx_80211.h b/drivers/net/wireless/ti/wlcore/wl12xx_80211.h index 181be725eff8..1dd7ecc11f86 100644 --- a/drivers/net/wireless/ti/wlcore/wl12xx_80211.h +++ b/drivers/net/wireless/ti/wlcore/wl12xx_80211.h @@ -66,7 +66,7 @@ struct ieee80211_header { u8 sa[ETH_ALEN]; u8 bssid[ETH_ALEN]; __le16 seq_ctl; - u8 payload[0]; + u8 payload[]; } __packed; struct wl12xx_ie_header {