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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 2DB0FC3A5A9 for ; Mon, 4 May 2020 18:13:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A9AF20663 for ; Mon, 4 May 2020 18:13:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615982; bh=EYGiP80ckm0hgyhK37euN31ArZTwB5jDope/198K8Bc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ws7FyV5Bx3ih454XH/miGg0MqbeWpRsT4FUPK5xtv7/2q+qyNZ23klNuGoKegNmfM /bvQ3DFK8Dh95QmZRZZXkDuEecKwQjAxGphQsChoO+BkOJ5Fu2gstv6qMp6vxxyNy3 CwyYEijD0FVRfAMQq9YqI5rnFh1LCrbByAJC+Suw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732307AbgEDSNB (ORCPT ); Mon, 4 May 2020 14:13:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:57858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731250AbgEDSB4 (ORCPT ); Mon, 4 May 2020 14:01:56 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D52552073B; Mon, 4 May 2020 18:01:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615316; bh=EYGiP80ckm0hgyhK37euN31ArZTwB5jDope/198K8Bc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hnugWNUHORbl6ZRBUQ4CtB/4f12LQhaT0E0Yw0D2iTg9YAwMI6oZYFfPvLtzjaEqD 9emEs+09kYvqkaHq0r0N+prDaUZvxDEFntrgSWIAUWJwwuP8aFGaHTCmXXnTHHUBeC +E/2jWappszWqGP2Sc/AhErG9wvqXUFsKrlmS6Fo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiyu Yang , Andreas Gruenbacher , Trond Myklebust Subject: [PATCH 4.19 27/37] nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl Date: Mon, 4 May 2020 19:57:40 +0200 Message-Id: <20200504165451.248823635@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200504165448.264746645@linuxfoundation.org> References: <20200504165448.264746645@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andreas Gruenbacher commit 7648f939cb919b9d15c21fff8cd9eba908d595dc upstream. nfs3_set_acl keeps track of the acl it allocated locally to determine if an acl needs to be released at the end. This results in a memory leak when the function allocates an acl as well as a default acl. Fix by releasing acls that differ from the acl originally passed into nfs3_set_acl. Fixes: b7fa0554cf1b ("[PATCH] NFS: Add support for NFSv3 ACLs") Reported-by: Xiyu Yang Signed-off-by: Andreas Gruenbacher Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs3acl.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) --- a/fs/nfs/nfs3acl.c +++ b/fs/nfs/nfs3acl.c @@ -255,37 +255,45 @@ int nfs3_proc_setacls(struct inode *inod int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type) { - struct posix_acl *alloc = NULL, *dfacl = NULL; + struct posix_acl *orig = acl, *dfacl = NULL, *alloc; int status; if (S_ISDIR(inode->i_mode)) { switch(type) { case ACL_TYPE_ACCESS: - alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT); + alloc = get_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(alloc)) goto fail; + dfacl = alloc; break; case ACL_TYPE_DEFAULT: - dfacl = acl; - alloc = acl = get_acl(inode, ACL_TYPE_ACCESS); + alloc = get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(alloc)) goto fail; + dfacl = acl; + acl = alloc; break; } } if (acl == NULL) { - alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); + alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); if (IS_ERR(alloc)) goto fail; + acl = alloc; } status = __nfs3_proc_setacls(inode, acl, dfacl); - posix_acl_release(alloc); +out: + if (acl != orig) + posix_acl_release(acl); + if (dfacl != orig) + posix_acl_release(dfacl); return status; fail: - return PTR_ERR(alloc); + status = PTR_ERR(alloc); + goto out; } const struct xattr_handler *nfs3_xattr_handlers[] = {