From patchwork Thu Aug 20 09:22:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 265532 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=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, 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 0D868C433E3 for ; Thu, 20 Aug 2020 11:48:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9DAB2078B for ; Thu, 20 Aug 2020 11:48:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597924116; bh=0rtzdLSxiMmDnqYJoiUoOiCfmLifAV7D4NzdX9nGwlY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=I2nJCsTakRvM5224YlO1a+aQbjzbADpi1qvyLo2+Nz28OhAV/MAJSBQKFiRzwMqFi wB60RSfOB/ccZmcroNIa1NnbZY6b1KxtG3voUxTY2Z351x7r/DjQPqJpMjUjSo9AZT q5X9A/Ht36d2DUi5UL8H2zO/Avtnu7ZrzUS5ObXU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730558AbgHTLsg (ORCPT ); Thu, 20 Aug 2020 07:48:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:53460 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730444AbgHTKD3 (ORCPT ); Thu, 20 Aug 2020 06:03:29 -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 AD2B82173E; Thu, 20 Aug 2020 10:03:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917799; bh=0rtzdLSxiMmDnqYJoiUoOiCfmLifAV7D4NzdX9nGwlY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=y/YzQ7N0by/aDhoe3zYaSXWwfLbJSODTvFJ3xzi/+fDFwa4zBdy8jTTU9uhI+8QWw 2+6R8WwhTCtf8MDG9RH8VmvYvNjc3c41FHRbBIf6dxY2adRQuxu6KSGA2C2pOmKqxi K8/SXf/Taxq24ZDAUkWFCRE8kqLzmNzRBL8/CU4E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+a9ac3de1b5de5fb10efc@syzkaller.appspotmail.com, syzbot+df958cf5688a96ad3287@syzkaller.appspotmail.com, Eric Biggers , Andrew Morton , Alexander Viro , Qiujun Huang , Linus Torvalds Subject: [PATCH 4.9 161/212] fs/minix: dont allow getting deleted inodes Date: Thu, 20 Aug 2020 11:22:14 +0200 Message-Id: <20200820091610.532819675@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Eric Biggers commit facb03dddec04e4aac1bb2139accdceb04deb1f3 upstream. If an inode has no links, we need to mark it bad rather than allowing it to be accessed. This avoids WARNINGs in inc_nlink() and drop_nlink() when doing directory operations on a fuzzed filesystem. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzbot+a9ac3de1b5de5fb10efc@syzkaller.appspotmail.com Reported-by: syzbot+df958cf5688a96ad3287@syzkaller.appspotmail.com Signed-off-by: Eric Biggers Signed-off-by: Andrew Morton Cc: Alexander Viro Cc: Qiujun Huang Cc: Link: http://lkml.kernel.org/r/20200628060846.682158-3-ebiggers@kernel.org Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/minix/inode.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) --- a/fs/minix/inode.c +++ b/fs/minix/inode.c @@ -472,6 +472,13 @@ static struct inode *V1_minix_iget(struc iget_failed(inode); return ERR_PTR(-EIO); } + if (raw_inode->i_nlinks == 0) { + printk("MINIX-fs: deleted inode referenced: %lu\n", + inode->i_ino); + brelse(bh); + iget_failed(inode); + return ERR_PTR(-ESTALE); + } inode->i_mode = raw_inode->i_mode; i_uid_write(inode, raw_inode->i_uid); i_gid_write(inode, raw_inode->i_gid); @@ -505,6 +512,13 @@ static struct inode *V2_minix_iget(struc iget_failed(inode); return ERR_PTR(-EIO); } + if (raw_inode->i_nlinks == 0) { + printk("MINIX-fs: deleted inode referenced: %lu\n", + inode->i_ino); + brelse(bh); + iget_failed(inode); + return ERR_PTR(-ESTALE); + } inode->i_mode = raw_inode->i_mode; i_uid_write(inode, raw_inode->i_uid); i_gid_write(inode, raw_inode->i_gid);