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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 B5A61C43381 for ; Fri, 22 Mar 2019 13:01:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 87122213F2 for ; Fri, 22 Mar 2019 13:01:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553259680; bh=NoGkgYPjIRqneXQOauPfaJH4dSnnm7+1zCHqT6+dXT4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Afr2WIQWQvtMDkNE0GwSEXZiqZRKBz4yCeVJtOiv8jtRdq6A9nFwKHGiUgFtMFkLl Kn7ruDns6FuEl0zNnnFgiajyjB73Vn7uFeBAAtp2Gl6di3CYYDDe7Re3oIQX6i3OzV coiktL4TR0j8y5lqPw1r6NRfHnU2mktu4jtWo+PU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731625AbfCVLnH (ORCPT ); Fri, 22 Mar 2019 07:43:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:45746 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731619AbfCVLnH (ORCPT ); Fri, 22 Mar 2019 07:43:07 -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 E6BA3218B0; Fri, 22 Mar 2019 11:43:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553254986; bh=NoGkgYPjIRqneXQOauPfaJH4dSnnm7+1zCHqT6+dXT4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PsZKJHXnai5Z++nGAY86Jn0xuf2RUNySiojn97n8eRaf31pBOWFXQG38/dj8AMVIw vfbN78/4WIB+7h13x+H11RwmDISQw8uZ2DgRCdC/GQlwz8KT1o8hrcI195K/DgNApC HZaYcebpZ7zxIHw8e4Pi/6fP5Klmr+ZWqT4jC6LY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Kara , Theodore Tso Subject: [PATCH 4.9 072/118] ext4: fix crash during online resizing Date: Fri, 22 Mar 2019 12:15:44 +0100 Message-Id: <20190322111221.742909148@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190322111215.873964544@linuxfoundation.org> References: <20190322111215.873964544@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jan Kara commit f96c3ac8dfc24b4e38fc4c2eba5fea2107b929d1 upstream. When computing maximum size of filesystem possible with given number of group descriptor blocks, we forget to include s_first_data_block into the number of blocks. Thus for filesystems with non-zero s_first_data_block it can happen that computed maximum filesystem size is actually lower than current filesystem size which confuses the code and eventually leads to a BUG_ON in ext4_alloc_group_tables() hitting on flex_gd->count == 0. The problem can be reproduced like: truncate -s 100g /tmp/image mkfs.ext4 -b 1024 -E resize=262144 /tmp/image 32768 mount -t ext4 -o loop /tmp/image /mnt resize2fs /dev/loop0 262145 resize2fs /dev/loop0 300000 Fix the problem by properly including s_first_data_block into the computed number of filesystem blocks. Fixes: 1c6bd7173d66 "ext4: convert file system to meta_bg if needed..." Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/resize.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1928,7 +1928,8 @@ retry: le16_to_cpu(es->s_reserved_gdt_blocks); n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); n_blocks_count = (ext4_fsblk_t)n_group * - EXT4_BLOCKS_PER_GROUP(sb); + EXT4_BLOCKS_PER_GROUP(sb) + + le32_to_cpu(es->s_first_data_block); n_group--; /* set to last group number */ }