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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0B95C6FA99 for ; Fri, 10 Mar 2023 14:40:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232731AbjCJOko (ORCPT ); Fri, 10 Mar 2023 09:40:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232691AbjCJOkn (ORCPT ); Fri, 10 Mar 2023 09:40:43 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 777C51219D5 for ; Fri, 10 Mar 2023 06:40:42 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 12B6B616F0 for ; Fri, 10 Mar 2023 14:40:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B7B8C4339C; Fri, 10 Mar 2023 14:40:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678459241; bh=lh3p5uz4L58rUSOcU2sjNfEdXFaUCTMZyhij+AdWdmc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g4GOocp9lrJ9XjE4w5+90ZEt/Ms/GUOQ7uWm+35n7zG9OwzamsuxTHZ5HPRLzKh8a Eujo0SQcH/pFS3mTg2ic+rLVjIwsPXRew6pAld3e75odf0zeRY2FX0JqPzN+33NYVx SQWwHOCXN5L40Hmlgx+RHn00IxTYVqMo4shc3WPk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhihao Cheng , Richard Weinberger , Sasha Levin Subject: [PATCH 5.4 296/357] ubifs: do_rename: Fix wrong space budget when target inodes nlink > 1 Date: Fri, 10 Mar 2023 14:39:45 +0100 Message-Id: <20230310133747.813910447@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133733.973883071@linuxfoundation.org> References: <20230310133733.973883071@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zhihao Cheng [ Upstream commit 25fce616a61fc2f1821e4a9ce212d0e064707093 ] If target inode is a special file (eg. block/char device) with nlink count greater than 1, the inode with ui->data will be re-written on disk. However, UBIFS losts target inode's data_len while doing space budget. Bad space budget may let make_reservation() return with -ENOSPC, which could turn ubifs to read-only mode in do_writepage() process. Fetch a reproducer in [Link]. Link: https://bugzilla.kernel.org/show_bug.cgi?id=216494 Fixes: 1e51764a3c2ac0 ("UBIFS: add new flash file system") Signed-off-by: Zhihao Cheng Signed-off-by: Richard Weinberger Signed-off-by: Sasha Levin --- fs/ubifs/dir.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 9a4f9563aceea..332c0b02a0ade 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -1296,6 +1296,8 @@ static int do_rename(struct inode *old_dir, struct dentry *old_dentry, if (unlink) { ubifs_assert(c, inode_is_locked(new_inode)); + /* Budget for old inode's data when its nlink > 1. */ + req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8); err = ubifs_purge_xattrs(new_inode); if (err) return err; -- 2.39.2