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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 9DAABC43603 for ; Wed, 11 Dec 2019 15:55:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 675432073B for ; Wed, 11 Dec 2019 15:55:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576079700; bh=Orn8VfWLBuTpWgne0Qxq93LqFLsUbv5C7WvmQvNYOcs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Mgti5eEFSTYNmIVU4oDsaFABWV+yn/fcgCO/HfYHgRT4aNIAiWKA308NWp4c4a/Bb 8YBpDIo0idcBdQZLgW6u+ILQ27jQHgu7vi5vCms/zsciK6yNK1bHM5Rg7jptKn1KZk nvhGPdGJE7nBZLGQBVUU6OYydR6qVAsRP2nByuTQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731805AbfLKPQ5 (ORCPT ); Wed, 11 Dec 2019 10:16:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:44156 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731565AbfLKPQx (ORCPT ); Wed, 11 Dec 2019 10:16:53 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 209D320663; Wed, 11 Dec 2019 15:16:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576077412; bh=Orn8VfWLBuTpWgne0Qxq93LqFLsUbv5C7WvmQvNYOcs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nQB/YUPjD3OSJ7L4bNVyY4QknLVTiDuS+zNf40wBG+YSYGqNySAPAOHEdeMuQLiXF r9kJHJzZ02Vrl6SLRtDrglmWWLXDf3w0YtW04+kEysPXBXgSZbpNqBk40lTbSFPX7t NGjKjqSnARJXipMetY1HI7DGCE+daJM41HEi3CYU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Ladislav Michl , Felipe Balbi Subject: [PATCH 4.19 005/243] usb: gadget: u_serial: add missing port entry locking Date: Wed, 11 Dec 2019 16:02:47 +0100 Message-Id: <20191211150339.527661587@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191211150339.185439726@linuxfoundation.org> References: <20191211150339.185439726@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michał Mirosław commit daf82bd24e308c5a83758047aff1bd81edda4f11 upstream. gserial_alloc_line() misses locking (for a release barrier) while resetting port entry on TTY allocation failure. Fix this. Cc: stable@vger.kernel.org Signed-off-by: Michał Mirosław Reviewed-by: Greg Kroah-Hartman Tested-by: Ladislav Michl Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/u_serial.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/usb/gadget/function/u_serial.c +++ b/drivers/usb/gadget/function/u_serial.c @@ -1246,8 +1246,10 @@ int gserial_alloc_line(unsigned char *li __func__, port_num, PTR_ERR(tty_dev)); ret = PTR_ERR(tty_dev); + mutex_lock(&ports[port_num].lock); port = ports[port_num].port; ports[port_num].port = NULL; + mutex_unlock(&ports[port_num].lock); gserial_free_port(port); goto err; }