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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 574D6C3276C for ; Thu, 2 Jan 2020 22:16:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21F802253D for ; Thu, 2 Jan 2020 22:16:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003362; bh=XZ1U8JnRfsOdge9C/Nkv34u0lxhGTLvWnD34+oshmKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dbcPvmfJuxhQ16NrBMwuofrFJNSu6KA5MuUOpNubOtQtrfxVJXQQurmcXLAKubiuv 7DUXryzaACLqGNe/E57Oylja8czkU0zu9LEuA+Oq//2Sof4zHFaTSvi7soFHFiPK4p 617Rj36MDMB7X5ZSgl/82zIREjzJ/BSes+I27jss= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727260AbgABWQB (ORCPT ); Thu, 2 Jan 2020 17:16:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:57464 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728167AbgABWP5 (ORCPT ); Thu, 2 Jan 2020 17:15:57 -0500 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 4015222314; Thu, 2 Jan 2020 22:15:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003356; bh=XZ1U8JnRfsOdge9C/Nkv34u0lxhGTLvWnD34+oshmKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TVk4Zdk9OylCB9BbYjLIMwFbgCkdH+5uz4lSC8Y/b/r1beS8WD9hG8uH5YpWMsiYI pZwxsNnycnpAKEqO4Px79T7/RfSNCJjfRBE9OCyOav2+PDosnkY1fTZ9Fzjd271g4s tz7ppgenYsV3B/hvXu8EyXpCLQY8NOu94NBo9mjo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chengguang Xu , Mike Kravetz , David Howells , Al Viro , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 5.4 127/191] mm/hugetlbfs: fix error handling when setting up mounts Date: Thu, 2 Jan 2020 23:06:49 +0100 Message-Id: <20200102215843.357330718@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102215829.911231638@linuxfoundation.org> References: <20200102215829.911231638@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: Mike Kravetz [ Upstream commit 8fc312b32b25c6b0a8b46fab4df8c68df5af1223 ] It is assumed that the hugetlbfs_vfsmount[] array will contain either a valid vfsmount pointer or NULL for each hstate after initialization. Changes made while converting to use fs_context broke this assumption. While fixing the hugetlbfs_vfsmount issue, it was discovered that init_hugetlbfs_fs never did correctly clean up when encountering a vfs mount error. It was found during code inspection. A small memory allocation failure would be the most likely cause of taking a error path with the bug. This is unlikely to happen as this is early init code. Link: http://lkml.kernel.org/r/94b6244d-2c24-e269-b12c-e3ba694b242d@oracle.com Reported-by: Chengguang Xu Fixes: 32021982a324 ("hugetlbfs: Convert to fs_context") Signed-off-by: Mike Kravetz Cc: David Howells Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/hugetlbfs/inode.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index a478df035651..26e3906c18fe 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -1461,28 +1461,41 @@ static int __init init_hugetlbfs_fs(void) sizeof(struct hugetlbfs_inode_info), 0, SLAB_ACCOUNT, init_once); if (hugetlbfs_inode_cachep == NULL) - goto out2; + goto out; error = register_filesystem(&hugetlbfs_fs_type); if (error) - goto out; + goto out_free; + /* default hstate mount is required */ + mnt = mount_one_hugetlbfs(&hstates[default_hstate_idx]); + if (IS_ERR(mnt)) { + error = PTR_ERR(mnt); + goto out_unreg; + } + hugetlbfs_vfsmount[default_hstate_idx] = mnt; + + /* other hstates are optional */ i = 0; for_each_hstate(h) { + if (i == default_hstate_idx) + continue; + mnt = mount_one_hugetlbfs(h); - if (IS_ERR(mnt) && i == 0) { - error = PTR_ERR(mnt); - goto out; - } - hugetlbfs_vfsmount[i] = mnt; + if (IS_ERR(mnt)) + hugetlbfs_vfsmount[i] = NULL; + else + hugetlbfs_vfsmount[i] = mnt; i++; } return 0; - out: + out_unreg: + (void)unregister_filesystem(&hugetlbfs_fs_type); + out_free: kmem_cache_destroy(hugetlbfs_inode_cachep); - out2: + out: return error; } fs_initcall(init_hugetlbfs_fs) -- 2.20.1