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[2620:137:e000::1:20]) by mx.google.com with ESMTP id oo17-20020a17090b1c9100b00206012b593csi10049399pjb.33.2022.10.24.05.48.23; Mon, 24 Oct 2022 05:48:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=1mrZGVK3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233940AbiJXMlf (ORCPT + 99 others); Mon, 24 Oct 2022 08:41:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231256AbiJXMiF (ORCPT ); Mon, 24 Oct 2022 08:38:05 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5F028A1C1; Mon, 24 Oct 2022 05:06:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C03FF612E6; Mon, 24 Oct 2022 12:06:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D80FEC433D6; Mon, 24 Oct 2022 12:06:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666613169; bh=alETWVNsuyM1X64cVYCBiCkJ9fiVjtFgAaSa0450EIs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1mrZGVK3m6jVoRntgJoSFIKMo1eOj31ZyM3giS4/EAz8VtC5r/tl3cXwiP4WSe6Pe 2muMjNznUTHVbSOxe7DallKpt4oMTdy8nGQn7Sn50tKBtKBQVn/gmX0iFHc6yuAUJQ 0yFWrAy8GQeRikc0ZqCjhD9q+ZHSgg3uJdHuI8eQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ye Bin , Qu Wenruo , Filipe Manana , David Sterba Subject: [PATCH 5.4 035/255] btrfs: fix race between quota enable and quota rescan ioctl Date: Mon, 24 Oct 2022 13:29:05 +0200 Message-Id: <20221024113003.608998685@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113002.471093005@linuxfoundation.org> References: <20221024113002.471093005@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747573243421291327?= X-GMAIL-MSGID: =?utf-8?q?1747573243421291327?= From: Filipe Manana commit 331cd9461412e103d07595a10289de90004ac890 upstream. When enabling quotas, at btrfs_quota_enable(), after committing the transaction, we change fs_info->quota_root to point to the quota root we created and set BTRFS_FS_QUOTA_ENABLED at fs_info->flags. Then we try to start the qgroup rescan worker, first by initializing it with a call to qgroup_rescan_init() - however if that fails we end up freeing the quota root but we leave fs_info->quota_root still pointing to it, this can later result in a use-after-free somewhere else. We have previously set the flags BTRFS_FS_QUOTA_ENABLED and BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with -EINPROGRESS at btrfs_quota_enable(), which is possible if someone already called the quota rescan ioctl, and therefore started the rescan worker. So fix this by ignoring an -EINPROGRESS and asserting we can't get any other error. Reported-by: Ye Bin Link: https://lore.kernel.org/linux-btrfs/20220823015931.421355-1-yebin10@huawei.com/ CC: stable@vger.kernel.org # 4.19+ Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/qgroup.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1075,6 +1075,21 @@ out_add_root: fs_info->qgroup_rescan_running = true; btrfs_queue_work(fs_info->qgroup_rescan_workers, &fs_info->qgroup_rescan_work); + } else { + /* + * We have set both BTRFS_FS_QUOTA_ENABLED and + * BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with + * -EINPROGRESS. That can happen because someone started the + * rescan worker by calling quota rescan ioctl before we + * attempted to initialize the rescan worker. Failure due to + * quotas disabled in the meanwhile is not possible, because + * we are holding a write lock on fs_info->subvol_sem, which + * is also acquired when disabling quotas. + * Ignore such error, and any other error would need to undo + * everything we did in the transaction we just committed. + */ + ASSERT(ret == -EINPROGRESS); + ret = 0; } out_free_path: