From patchwork Mon Dec 28 12:49:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 353081 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=-18.8 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, 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 57FD3C4332D for ; Mon, 28 Dec 2020 16:19:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 290C62084D for ; Mon, 28 Dec 2020 16:19:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2633052AbgL1QTA (ORCPT ); Mon, 28 Dec 2020 11:19:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:43560 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731826AbgL1NPT (ORCPT ); Mon, 28 Dec 2020 08:15:19 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9747F2076D; Mon, 28 Dec 2020 13:14:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609161278; bh=4jLqyF3EjFvGTRYAS3QjW9dDV4q6T3QEhnp5c8bsMhY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xCPY+ErRdNhjTteEcRM9ry2ajIbK4H+3j7d15OnqL8On7G6sCGo4bxXpHJGhoMYPw xmx76RBjsId7sRii1ue6ymm4go57iphtSfdPUV+YIw/iRR1BoC5/e4/JJieFAxyzjU bf8nQKcLcuD6EuSsLg5DJ0Zj1KxewoGk/aMt6kRs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anton Ivanov , Richard Weinberger , Sasha Levin Subject: [PATCH 4.14 161/242] um: chan_xterm: Fix fd leak Date: Mon, 28 Dec 2020 13:49:26 +0100 Message-Id: <20201228124912.624507220@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124904.654293249@linuxfoundation.org> References: <20201228124904.654293249@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Anton Ivanov [ Upstream commit 9431f7c199ab0d02da1482d62255e0b4621cb1b5 ] xterm serial channel was leaking a fd used in setting up the port helper This bug is prehistoric - it predates switching to git. The "fixes" header here is really just to mark all the versions we would like this to apply to which is "Anything from the Cretaceous period onwards". No dinosaurs were harmed in fixing this bug. Fixes: b40997b872cd ("um: drivers/xterm.c: fix a file descriptor leak") Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger Signed-off-by: Sasha Levin --- arch/um/drivers/xterm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c index 20e30be44795b..e3b422ebce09f 100644 --- a/arch/um/drivers/xterm.c +++ b/arch/um/drivers/xterm.c @@ -18,6 +18,7 @@ struct xterm_chan { int pid; int helper_pid; + int chan_fd; char *title; int device; int raw; @@ -33,6 +34,7 @@ static void *xterm_init(char *str, int device, const struct chan_opts *opts) return NULL; *data = ((struct xterm_chan) { .pid = -1, .helper_pid = -1, + .chan_fd = -1, .device = device, .title = opts->xterm_title, .raw = opts->raw } ); @@ -149,6 +151,7 @@ static int xterm_open(int input, int output, int primary, void *d, goto out_kill; } + data->chan_fd = fd; new = xterm_fd(fd, &data->helper_pid); if (new < 0) { err = new; @@ -206,6 +209,8 @@ static void xterm_close(int fd, void *d) os_kill_process(data->helper_pid, 0); data->helper_pid = -1; + if (data->chan_fd != -1) + os_close_file(data->chan_fd); os_close_file(fd); }