From mboxrd@z Thu Jan 1 00:00:00 1970 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,USER_AGENT_SANE_1 autolearn=ham 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 C83F4C4BA21 for ; Wed, 26 Feb 2020 21:24:03 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9374424653 for ; Wed, 26 Feb 2020 21:24:03 +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="BZl1WCjg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9374424653 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=embeddedor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j749V-0001H0-L2; Wed, 26 Feb 2020 21:23:33 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j749U-0001Gv-HA for xen-devel@lists.xenproject.org; Wed, 26 Feb 2020 21:23:32 +0000 X-Inumbo-ID: 3cef489a-58de-11ea-a490-bc764e2007e4 Received: from gateway34.websitewelcome.com (unknown [192.185.149.77]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 3cef489a-58de-11ea-a490-bc764e2007e4; Wed, 26 Feb 2020 21:23:31 +0000 (UTC) Received: from cm13.websitewelcome.com (cm13.websitewelcome.com [100.42.49.6]) by gateway34.websitewelcome.com (Postfix) with ESMTP id 805F2338EAF for ; Wed, 26 Feb 2020 15:23:31 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 749TjYtY3RP4z749TjxcVi; Wed, 26 Feb 2020 15:23:31 -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=96f8kZdh7WxJBTeep/qoxEO5hEENwT7hPTi1FGgDDyQ=; b=BZl1WCjgZtTNu6aGLvvU4/iPRW KLaA1o7tDonP3BUGMMHpFTH76EWmdNlvIEgVkNuMfKiiZDRQe7i00Bf5C2djTnOF+TcPoYjgNKncA Rlqx5Ed5Ra7TtDi9045eAvLfhpfmdWkr6BdOj1U1j6rxT+1kY/qpWzi2R72Qh49C2R7mauhdDHCTG snYO5LP6796MkyQirOLPQ+m483LtTmhx20oZlAze2cojPgR01142altotg30XfkciRi+LRxCckTCd HPHeyB5uYVzEWI5qUaAsA2gTE8sOZ2IFKcI4zv9NnCa5B7N0FTXEmmOKZlauQzSKfqO/Ro6LjxnZ8 gzd3TRow==; Received: from [201.162.161.180] (port=47722 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j749R-000nRw-Iy; Wed, 26 Feb 2020 15:23:30 -0600 Date: Wed, 26 Feb 2020 15:26:12 -0600 From: "Gustavo A. R. Silva" To: Boris Ostrovsky , Juergen Gross , Stefano Stabellini Message-ID: <20200226212612.GA4663@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 - lists.xenproject.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 201.162.161.180 X-Source-L: No X-Exim-ID: 1j749R-000nRw-Iy X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [201.162.161.180]:47722 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 20 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Subject: [Xen-devel] [PATCH] xen: Replace zero-length array with flexible-array member X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, "Gustavo A. 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Wed, 26 Feb 2020 15:23:30 -0600 Date: Wed, 26 Feb 2020 15:26:12 -0600 From: "Gustavo A. R. Silva" To: Boris Ostrovsky , Juergen Gross , Stefano Stabellini Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] xen: Replace zero-length array with flexible-array member Message-ID: <20200226212612.GA4663@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii 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: 201.162.161.180 X-Source-L: No X-Exim-ID: 1j749R-000nRw-Iy X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [201.162.161.180]:47722 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 21 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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/xen/xen-pciback/pciback.h | 2 +- include/xen/interface/io/tpmif.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/xen/xen-pciback/pciback.h b/drivers/xen/xen-pciback/pciback.h index ce1077e32466..7c95516a860f 100644 --- a/drivers/xen/xen-pciback/pciback.h +++ b/drivers/xen/xen-pciback/pciback.h @@ -52,7 +52,7 @@ struct xen_pcibk_dev_data { unsigned int ack_intr:1; /* .. and ACK-ing */ unsigned long handled; unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */ - char irq_name[0]; /* xen-pcibk[000:04:00.0] */ + char irq_name[]; /* xen-pcibk[000:04:00.0] */ }; /* Used by XenBus and xen_pcibk_ops.c */ diff --git a/include/xen/interface/io/tpmif.h b/include/xen/interface/io/tpmif.h index 28e7dcd75e82..f8aa8bac5196 100644 --- a/include/xen/interface/io/tpmif.h +++ b/include/xen/interface/io/tpmif.h @@ -46,7 +46,7 @@ struct vtpm_shared_page { uint8_t pad; uint8_t nr_extra_pages; /* extra pages for long packets; may be zero */ - uint32_t extra_pages[0]; /* grant IDs; length in nr_extra_pages */ + uint32_t extra_pages[]; /* grant IDs; length in nr_extra_pages */ }; #endif -- 2.25.0