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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 DB4ECC54E49 for ; Thu, 7 May 2020 14:30:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B145220870 for ; Thu, 7 May 2020 14:30:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588861809; bh=y6xNY4FUPfwME4g40KTEXsNeJ2mHn/jJnx4h7P1rEgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Blj21bXjazFvpuyehqZxqEgoTCSsBQeTlXYla6KCpspzYQrgNcoKnYKL7ApBB0Czz uZeuv/wm04P/9/x+W9OEQmu8Tg0erppF4DtWvGctMIiEVcybywXiFoWD452ohpbkrG Ex/6/3nm1LAPaZX/X0Oqvqxd1/eUtXLlZGH8ttqk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728761AbgEGOaH (ORCPT ); Thu, 7 May 2020 10:30:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:58654 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728759AbgEGOaH (ORCPT ); Thu, 7 May 2020 10:30:07 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1082D2073A; Thu, 7 May 2020 14:30:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588861806; bh=y6xNY4FUPfwME4g40KTEXsNeJ2mHn/jJnx4h7P1rEgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W2Imevlvt4REE5IRFqYvU3rNeM+4OoFt9T1zh+4KilkgGU94+KtxMO3nqpsdVqt/V d9AR0rrGZHpcV9M3y9qhNXGUbehpSfFckcjC+DmDIv6mpsf4XwmqY1OAgGISlzpTF9 aP2b63DcHISJFgydgrtc3Mlu9RoMP3a7HhpSsGus= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andreas Gruenbacher , Xiyu Yang , Trond Myklebust , Sasha Levin , linux-nfs@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 02/11] nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl Date: Thu, 7 May 2020 10:29:54 -0400 Message-Id: <20200507143003.27047-2-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200507143003.27047-1-sashal@kernel.org> References: <20200507143003.27047-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andreas Gruenbacher [ Upstream commit 7648f939cb919b9d15c21fff8cd9eba908d595dc ] 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: Sasha Levin --- fs/nfs/nfs3acl.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c index 720d92f5abfb8..6c378435fa291 100644 --- a/fs/nfs/nfs3acl.c +++ b/fs/nfs/nfs3acl.c @@ -252,37 +252,45 @@ int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 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[] = { -- 2.20.1