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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03740C43334 for ; Thu, 2 Jun 2022 10:45:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233988AbiFBKpZ (ORCPT ); Thu, 2 Jun 2022 06:45:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230270AbiFBKpU (ORCPT ); Thu, 2 Jun 2022 06:45:20 -0400 Received: from a.mx.secunet.com (a.mx.secunet.com [62.96.220.36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5081B6335; Thu, 2 Jun 2022 03:45:19 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by a.mx.secunet.com (Postfix) with ESMTP id D246B205CD; Thu, 2 Jun 2022 12:45:16 +0200 (CEST) X-Virus-Scanned: by secunet Received: from a.mx.secunet.com ([127.0.0.1]) by localhost (a.mx.secunet.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mtn_T9EtDur0; Thu, 2 Jun 2022 12:45:16 +0200 (CEST) Received: from mailout1.secunet.com (mailout1.secunet.com [62.96.220.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by a.mx.secunet.com (Postfix) with ESMTPS id 5A821204A4; Thu, 2 Jun 2022 12:45:16 +0200 (CEST) Received: from cas-essen-01.secunet.de (unknown [10.53.40.201]) by mailout1.secunet.com (Postfix) with ESMTP id 4C21580004A; Thu, 2 Jun 2022 12:45:16 +0200 (CEST) Received: from mbx-essen-01.secunet.de (10.53.40.197) by cas-essen-01.secunet.de (10.53.40.201) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 2 Jun 2022 12:45:16 +0200 Received: from gauss2.secunet.de (10.182.7.193) by mbx-essen-01.secunet.de (10.53.40.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 2 Jun 2022 12:45:15 +0200 Received: by gauss2.secunet.de (Postfix, from userid 1000) id 8E8693182D6D; Thu, 2 Jun 2022 12:45:15 +0200 (CEST) Date: Thu, 2 Jun 2022 12:45:15 +0200 From: Steffen Klassert To: Stephen Hemminger CC: , Herbert Xu , "David S. Miller" , open list Subject: Re: [RFC] xfrm: convert alg_key to flexible array member Message-ID: <20220602104515.GI91220@gauss3.secunet.de> References: <20220524204741.980721-1-stephen@networkplumber.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220524204741.980721-1-stephen@networkplumber.org> X-ClientProxiedBy: cas-essen-02.secunet.de (10.53.40.202) To mbx-essen-01.secunet.de (10.53.40.197) X-EXCLAIMER-MD-CONFIG: 2c86f778-e09b-4440-8b15-867914633a10 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 24, 2022 at 01:47:40PM -0700, Stephen Hemminger wrote: > Iproute2 build generates a warning when built with gcc-12. > This is because the alg_key in xfrm.h API has zero size > array element instead of flexible array. > > CC xfrm_state.o > In function ‘xfrm_algo_parse’, > inlined from ‘xfrm_state_modify.constprop’ at xfrm_state.c:573:5: > xfrm_state.c:162:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] > 162 | buf[j] = val; > | ~~~~~~~^~~~~ > > This patch convert the alg_key into flexible array member. > There are other zero size arrays here that should be converted as > well. > > This patch is RFC only since it is only compile tested and > passes trivial iproute2 tests. > > Signed-off-by: Stephen Hemminger I've put this today to our test systems and it showed no problems, so we can integrate it after the merge window.