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[2620:137:e000::3:4]) by mx.google.com with ESMTPS id cl2-20020a056a02098200b005859e8c7c22si9423688pgb.658.2023.10.24.14.48.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Oct 2023 14:48:40 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) client-ip=2620:137:e000::3:4; Authentication-Results: mx.google.com; dkim=pass header.i=@wanadoo.fr header.s=t20230301 header.b=RyiQB+iF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=wanadoo.fr Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by howler.vger.email (Postfix) with ESMTP id B84E1806AFDB; Tue, 24 Oct 2023 14:48:38 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at howler.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344408AbjJXVsb (ORCPT + 99 others); Tue, 24 Oct 2023 17:48:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234971AbjJXVsa (ORCPT ); Tue, 24 Oct 2023 17:48:30 -0400 Received: from smtp.smtpout.orange.fr (smtp-22.smtpout.orange.fr [80.12.242.22]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B8791B3 for ; Tue, 24 Oct 2023 14:48:27 -0700 (PDT) Received: from localhost.localdomain ([141.170.221.62]) by smtp.orange.fr with ESMTPA id vPGBqZo62QRiPvPGBqyjSG; Tue, 24 Oct 2023 23:48:25 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wanadoo.fr; s=t20230301; t=1698184105; bh=1yYR+ID0Mz0XbBfGN+NzNx5JNviXZsmBmncVbRmUG7g=; h=From:To:Cc:Subject:Date; b=RyiQB+iFm3iOfwasBnQWnJn1ove8eCS7mgflHV15KRBlHBVJtSCA4HkPhL1LZTQ3E VxHDWNKDd+hpHmWlDx9ATTHXlVRRieE4SDUaHYD93pzWE00pvmJf9+O5fPAXr4zAdm GwhCULy2kBImzbQsRMHIo7tdR9ws4d+DvbitdaXzei91gkp8rmxwUdqodV82z0smqX nJKGQM8MpNFoUuV2lgLH0CGyyJK9JjLnK06mSQvHuyaCFMvV7QJXJOrfZqqJs2u67z Q5uKZvCXF9fZscpRJw22480bt5mkw0d1dfSPinDZjX8k7sodRCUdAfuiUAKY0B6+6j 8OZasVVLpv4rg== X-ME-Helo: localhost.localdomain X-ME-Auth: Y2hyaXN0b3BoZS5qYWlsbGV0QHdhbmFkb28uZnI= X-ME-Date: Tue, 24 Oct 2023 23:48:25 +0200 X-ME-IP: 141.170.221.62 From: Christophe JAILLET To: trond.myklebust@hammerspace.com, anna@kernel.org, chuck.lever@oracle.com Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET Subject: [PATCH] NFS: Fix an off by one in root_nfs_cat() Date: Tue, 24 Oct 2023 23:47:42 +0200 Message-Id: <7f97bb62c4e8137c5d7f7a7a30789440a5102b3f.1698183837.git.christophe.jaillet@wanadoo.fr> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on howler.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Tue, 24 Oct 2023 14:48:38 -0700 (PDT) The intent is to check if the 'dest' is truncated or not. So, >+ should be used instead of >, because strlcat() returns the length of 'dest' and 'src' excluding the trailing NULL. Fixes: 56463e50d1fc ("NFS: Use super.c for NFSROOT mount option parsing") Signed-off-by: Christophe JAILLET --- fs/nfs/nfsroot.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c index 7600100ba26f..432612d22437 100644 --- a/fs/nfs/nfsroot.c +++ b/fs/nfs/nfsroot.c @@ -175,10 +175,10 @@ static int __init root_nfs_cat(char *dest, const char *src, size_t len = strlen(dest); if (len && dest[len - 1] != ',') - if (strlcat(dest, ",", destlen) > destlen) + if (strlcat(dest, ",", destlen) >= destlen) return -1; - if (strlcat(dest, src, destlen) > destlen) + if (strlcat(dest, src, destlen) >= destlen) return -1; return 0; } -- 2.32.0