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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 78741C4363A for ; Mon, 26 Oct 2020 23:56:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36524221FA for ; Mon, 26 Oct 2020 23:56:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756600; bh=JKjFI77i7gZoC6zNEMxkzRxcHFE7FTZDCPVf1sy6D2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ea/e4VsewTNpWGcw3sg/d9YFDVsAHLqFNY5t2C1R+mXQZTZ4v2sdyCQr7ZUjPnrh1 L03gwsnBtw/FrG9dQUA4DKPMNQhKeTDrSZt/3cTT6XLKF82XvMPiLMIpvRgpXXYOZs V45RfxZlaMbgz3638etUhnyDOANYpcu6/wfPqEYE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436529AbgJZX4j (ORCPT ); Mon, 26 Oct 2020 19:56:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:36658 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436509AbgJZX4i (ORCPT ); Mon, 26 Oct 2020 19:56:38 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 35E79221FA; Mon, 26 Oct 2020 23:56:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756595; bh=JKjFI77i7gZoC6zNEMxkzRxcHFE7FTZDCPVf1sy6D2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1LtPYQ8I6/LPn/kse7H7Xj5HUCtQVbhmRvPq86Kb0mf6KKLolu1VXjn+iE3WXm43W v3Rd/bzpVCfiZui+dkD2gN31TtQLD/U7V+ih7TJXc+OEStBuISzqu/6Ya9j0FPGJLC c7PcRtbK+2zRD6/ujJ6fXFTNOvJnrCyK4YflvBdM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jan Kara , Andreas Dilger , Ritesh Harjani , Theodore Ts'o , Sasha Levin , linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 65/80] ext4: Detect already used quota file early Date: Mon, 26 Oct 2020 19:55:01 -0400 Message-Id: <20201026235516.1025100-65-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201026235516.1025100-1-sashal@kernel.org> References: <20201026235516.1025100-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Jan Kara [ Upstream commit e0770e91424f694b461141cbc99adf6b23006b60 ] When we try to use file already used as a quota file again (for the same or different quota type), strange things can happen. At the very least lockdep annotations may be wrong but also inode flags may be wrongly set / reset. When the file is used for two quota types at once we can even corrupt the file and likely crash the kernel. Catch all these cases by checking whether passed file is already used as quota file and bail early in that case. This fixes occasional generic/219 failure due to lockdep complaint. Reviewed-by: Andreas Dilger Reported-by: Ritesh Harjani Signed-off-by: Jan Kara Link: https://lore.kernel.org/r/20201015110330.28716-1-jack@suse.cz Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/super.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4aae7e3e89a12..2603537b1f66b 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5856,6 +5856,11 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id, /* Quotafile not on the same filesystem? */ if (path->dentry->d_sb != sb) return -EXDEV; + + /* Quota already enabled for this file? */ + if (IS_NOQUOTA(d_inode(path->dentry))) + return -EBUSY; + /* Journaling quota? */ if (EXT4_SB(sb)->s_qf_names[type]) { /* Quotafile not in fs root? */ -- 2.25.1