From patchwork Mon Dec 28 12:50:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 353536 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, 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 8A3B3C4332B for ; Mon, 28 Dec 2020 14:40:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D93B20728 for ; Mon, 28 Dec 2020 14:40:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2505796AbgL1OkS (ORCPT ); Mon, 28 Dec 2020 09:40:18 -0500 Received: from mail.kernel.org ([198.145.29.99]:36896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503372AbgL1O3I (ORCPT ); Mon, 28 Dec 2020 09:29:08 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 82BB320731; Mon, 28 Dec 2020 14:28:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609165708; bh=i7OZ7g5EYwwab0/iT21/W9zFYz9gbkRlmjrjXA+IToU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zIki16rlR7gxCMXd7h5hPR3DI2//FRS1ElkTpyA6YIzVZbIZ0VScH21sMracQFYZZ r2gnouYjaM2qeNZoI4Bwb0OZiA74q0cU75oMSrthbZ4dov/Kl1EIDuNMcBBtJ915+5 qjhlRLjob1BE1CMJQGkD03406oxg7C9kYw5lTorI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zhe Li , Richard Weinberger Subject: [PATCH 5.10 627/717] jffs2: Fix GC exit abnormally Date: Mon, 28 Dec 2020 13:50:25 +0100 Message-Id: <20201228125050.960832948@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zhe Li commit 9afc9a8a4909fece0e911e72b1060614ba2f7969 upstream. The log of this problem is: jffs2: Error garbage collecting node at 0x***! jffs2: No space for garbage collection. Aborting GC thread This is because GC believe that it do nothing, so it abort. After going over the image of jffs2, I find a scene that can trigger this problem stably. The scene is: there is a normal dirent node at summary-area, but abnormal at corresponding not-summary-area with error name_crc. The reason that GC exit abnormally is because it find that abnormal dirent node to GC, but when it goes to function jffs2_add_fd_to_list, it cannot meet the condition listed below: if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) So no node is marked obsolete, statistical information of erase_block do not change, which cause GC exit abnormally. The root cause of this problem is: we do not check the name_crc of the abnormal dirent node with summary is enabled. Noticed that in function jffs2_scan_dirent_node, we use function jffs2_scan_dirty_space to deal with the dirent node with error name_crc. So this patch add a checking code in function read_direntry to ensure the correctness of dirent node. If checked failed, the dirent node will be marked obsolete so GC will pass this node and this problem will be fixed. Cc: Signed-off-by: Zhe Li Signed-off-by: Richard Weinberger Signed-off-by: Greg Kroah-Hartman --- fs/jffs2/readinode.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) --- a/fs/jffs2/readinode.c +++ b/fs/jffs2/readinode.c @@ -672,6 +672,22 @@ static inline int read_direntry(struct j jffs2_free_full_dirent(fd); return -EIO; } + +#ifdef CONFIG_JFFS2_SUMMARY + /* + * we use CONFIG_JFFS2_SUMMARY because without it, we + * have checked it while mounting + */ + crc = crc32(0, fd->name, rd->nsize); + if (unlikely(crc != je32_to_cpu(rd->name_crc))) { + JFFS2_NOTICE("name CRC failed on dirent node at" + "%#08x: read %#08x,calculated %#08x\n", + ref_offset(ref), je32_to_cpu(rd->node_crc), crc); + jffs2_mark_node_obsolete(c, ref); + jffs2_free_full_dirent(fd); + return 0; + } +#endif } fd->nhash = full_name_hash(NULL, fd->name, rd->nsize);