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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 81276C56201 for ; Wed, 11 Nov 2020 21:35:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 32C8920637 for ; Wed, 11 Nov 2020 21:35:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727667AbgKKVfJ (ORCPT ); Wed, 11 Nov 2020 16:35:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727252AbgKKVez (ORCPT ); Wed, 11 Nov 2020 16:34:55 -0500 Received: from smtp-8fab.mail.infomaniak.ch (smtp-8fab.mail.infomaniak.ch [IPv6:2001:1600:3:17::8fab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB0D9C0617A6; Wed, 11 Nov 2020 13:34:54 -0800 (PST) Received: from smtp-2-0001.mail.infomaniak.ch (unknown [10.5.36.108]) by smtp-2-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4CWdL51lB7zlhTHM; Wed, 11 Nov 2020 22:34:53 +0100 (CET) Received: from localhost (unknown [94.23.54.103]) by smtp-2-0001.mail.infomaniak.ch (Postfix) with ESMTPA id 4CWdL46qj1zlh8T5; Wed, 11 Nov 2020 22:34:52 +0100 (CET) From: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= To: James Morris , Jann Horn , "Serge E . Hallyn" Cc: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , Shuah Khan , Vincent Dagonneau , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-security-module@vger.kernel.org, kernel test robot Subject: [PATCH v1 7/9] landlock: Clean up get_ruleset_from_fd() Date: Wed, 11 Nov 2020 22:34:40 +0100 Message-Id: <20201111213442.434639-8-mic@digikod.net> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201111213442.434639-1-mic@digikod.net> References: <20201111213442.434639-1-mic@digikod.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Rewrite get_ruleset_from_fd() to please the 0-DAY CI Kernel Test Service that reported an uninitialized variable (false positive). Anyway, it is cleaner like this. Cc: James Morris Cc: Jann Horn Cc: Serge E. Hallyn Link: https://lore.kernel.org/linux-security-module/202011101854.zGbWwusK-lkp@intel.com/ Reported-by: kernel test robot Signed-off-by: Mickaël Salaün --- security/landlock/syscall.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/security/landlock/syscall.c b/security/landlock/syscall.c index 486136d4f46e..543ae36cd339 100644 --- a/security/landlock/syscall.c +++ b/security/landlock/syscall.c @@ -196,24 +196,26 @@ static struct landlock_ruleset *get_ruleset_from_fd(const int fd, { struct fd ruleset_f; struct landlock_ruleset *ruleset; - int err; ruleset_f = fdget(fd); if (!ruleset_f.file) return ERR_PTR(-EBADF); /* Checks FD type and access right. */ - err = 0; - if (ruleset_f.file->f_op != &ruleset_fops) - err = -EBADFD; - else if (!(ruleset_f.file->f_mode & mode)) - err = -EPERM; - if (!err) { - ruleset = ruleset_f.file->private_data; - landlock_get_ruleset(ruleset); + if (ruleset_f.file->f_op != &ruleset_fops) { + ruleset = ERR_PTR(-EBADFD); + goto out_fdput; } + if (!(ruleset_f.file->f_mode & mode)) { + ruleset = ERR_PTR(-EPERM); + goto out_fdput; + } + ruleset = ruleset_f.file->private_data; + landlock_get_ruleset(ruleset); + +out_fdput: fdput(ruleset_f); - return err ? ERR_PTR(err) : ruleset; + return ruleset; } /* Path handling */ -- 2.29.2