From patchwork Mon Nov 9 09:06:53 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhaolei X-Patchwork-Id: 7581781 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C3E059F2E9 for ; Mon, 9 Nov 2015 09:09:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E96712078B for ; Mon, 9 Nov 2015 09:09:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 91C152077C for ; Mon, 9 Nov 2015 09:09:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752489AbbKIJIy (ORCPT ); Mon, 9 Nov 2015 04:08:54 -0500 Received: from cn.fujitsu.com ([59.151.112.132]:34359 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752146AbbKIJIv (ORCPT ); Mon, 9 Nov 2015 04:08:51 -0500 X-IronPort-AV: E=Sophos;i="5.20,242,1444665600"; d="scan'208";a="245784" Received: from bogon (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 09 Nov 2015 17:08:37 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id tA998AIg027735 for ; Mon, 9 Nov 2015 17:08:10 +0800 Received: from localhost.localdomain (10.167.226.114) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server id 14.3.181.6; Mon, 9 Nov 2015 17:08:48 +0800 From: Zhao Lei To: CC: Zhao Lei Subject: [PATCH] btrfs-progs: Check periodic.timer_fd's value before use Date: Mon, 9 Nov 2015 17:06:53 +0800 Message-ID: X-Mailer: git-send-email 1.8.5.1 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP periodic.timer_fd's value is 0 on inititlize-failed case, if no value-checking before read(), the code will run as read(STDIN). This patch fixed above case. Signed-off-by: Zhao Lei --- task-utils.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/task-utils.c b/task-utils.c index a4017ff..12b0002 100644 --- a/task-utils.c +++ b/task-utils.c @@ -119,6 +119,9 @@ void task_period_wait(struct task_info *info) if (!info) return; + if (info->periodic.timer_fd == 0) + return; + ret = read(info->periodic.timer_fd, &missed, sizeof (missed)); if (ret == -1) return;