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[23.128.96.36]) by mx.google.com with ESMTPS id l7-20020a17090a850700b00268307ac3cfsi9567963pjn.185.2023.09.17.23.53.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Sep 2023 23:53:06 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) client-ip=23.128.96.36; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=zte.com.cn Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by pete.vger.email (Postfix) with ESMTP id E531B819802D; Sun, 17 Sep 2023 23:52:56 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at pete.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238411AbjIRGvy (ORCPT + 27 others); Mon, 18 Sep 2023 02:51:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239854AbjIRGvX (ORCPT ); Mon, 18 Sep 2023 02:51:23 -0400 Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.216.63.35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1EF2F12F; Sun, 17 Sep 2023 23:51:12 -0700 (PDT) Received: from mse-fl1.zte.com.cn (unknown [10.5.228.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mxhk.zte.com.cn (FangMail) with ESMTPS id 4RpwRv18VQz4xPYd; Mon, 18 Sep 2023 14:51:07 +0800 (CST) Received: from szxlzmapp05.zte.com.cn ([10.5.230.85]) by mse-fl1.zte.com.cn with SMTP id 38I6omNN027269; Mon, 18 Sep 2023 14:50:48 +0800 (+08) (envelope-from cheng.lin130@zte.com.cn) Received: from mapi (szxlzmapp07[null]) by mapi (Zmail) with MAPI id mid14; Mon, 18 Sep 2023 14:50:50 +0800 (CST) Date: Mon, 18 Sep 2023 14:50:50 +0800 (CST) X-Zmail-TransId: 2b096507f34a368-08e64 X-Mailer: Zmail v1.0 Message-ID: <202309181450509388561@zte.com.cn> Mime-Version: 1.0 From: To: , Cc: , , , , Subject: =?utf-8?q?=5BPATCH_v4=5D_xfs=3A_introduce_protection_for_drop_nlink?= X-MAIL: mse-fl1.zte.com.cn 38I6omNN027269 X-Fangmail-Gw-Spam-Type: 0 X-Fangmail-Anti-Spam-Filtered: true X-Fangmail-MID-QID: 6507F35B.000/4RpwRv18VQz4xPYd X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Sun, 17 Sep 2023 23:52:57 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777356334174389054 X-GMAIL-MSGID: 1777357276942451194 From: Cheng Lin When abnormal drop_nlink are detected on the inode, return error, to avoid corruption propagation. Signed-off-by: Cheng Lin --- fs/xfs/xfs_inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 9e62cc500..d16cb62ce 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -919,6 +919,14 @@ xfs_droplink( xfs_trans_t *tp, xfs_inode_t *ip) { + + if (VFS_I(ip)->i_nlink == 0) { + xfs_alert(ip->i_mount, + "%s: Deleting inode %llu with no links.", + __func__, ip->i_ino); + return -EFSCORRUPTED; + } + xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); drop_nlink(VFS_I(ip));