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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 E817AC43332 for ; Mon, 1 Mar 2021 22:42:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B184660201 for ; Mon, 1 Mar 2021 22:42:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343552AbhCAWgy (ORCPT ); Mon, 1 Mar 2021 17:36:54 -0500 Received: from mail.kernel.org ([198.145.29.99]:32854 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238364AbhCARmK (ORCPT ); Mon, 1 Mar 2021 12:42:10 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 35BCE650CF; Mon, 1 Mar 2021 16:57:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614617830; bh=l7UsS6s+geSISZVWy4Wdx/lWP2smWsWtS3a0K5VpQ5o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eYt796bQ4bxDSIk6JqdMEWg+ASGf8vPevxqVY1Lqa1tSN4QMaSZKGKVxDeCdPxanR vAkOpVb58MSEnq5jAUsv43x1mLnD8hxN9+3IDRV+hfYpXanTfXmSS8sQwgv1kW/pTB jf2/nOpWShssjyAdZyIYRcG4QrZyjd09aKsa9QFI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Artem Blagodarenko , Theodore Tso , Sasha Levin Subject: [PATCH 5.4 212/340] ext4: fix potential htree index checksum corruption Date: Mon, 1 Mar 2021 17:12:36 +0100 Message-Id: <20210301161058.734542176@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161048.294656001@linuxfoundation.org> References: <20210301161048.294656001@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Theodore Ts'o [ Upstream commit b5776e7524afbd4569978ff790864755c438bba7 ] In the case where we need to do an interior node split, and immediately afterwards, we are unable to allocate a new directory leaf block due to ENOSPC, the directory index checksum's will not be filled in correctly (and indeed, will not be correctly journalled). This looks like a bug that was introduced when we added largedir support. The original code doesn't make any sense (and should have been caught in code review), but it was hidden because most of the time, the index node checksum will be set by do_split(). But if do_split bails out due to ENOSPC, then ext4_handle_dirty_dx_node() won't get called, and so the directory index checksum field will not get set, leading to: EXT4-fs error (device sdb): dx_probe:858: inode #6635543: block 4022: comm nfsd: Directory index failed checksum Google-Bug-Id: 176345532 Fixes: e08ac99fa2a2 ("ext4: add largedir feature") Cc: Artem Blagodarenko Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/namei.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index f05ec9bfbf4fd..7f22487d502b5 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -2405,11 +2405,10 @@ again: (frame - 1)->bh); if (err) goto journal_error; - if (restart) { - err = ext4_handle_dirty_dx_node(handle, dir, - frame->bh); + err = ext4_handle_dirty_dx_node(handle, dir, + frame->bh); + if (err) goto journal_error; - } } else { struct dx_root *dxroot; memcpy((char *) entries2, (char *) entries, -- 2.27.0