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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 8CC79C43381 for ; Mon, 1 Apr 2019 17:30:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5E76620856 for ; Mon, 1 Apr 2019 17:30:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554139836; bh=YKrF8HsqFixDd71eOLAmxLe+ICN442VSNKKpH2ueAC4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q75f6WwLMnibYY2W0t2k/5kCqvHJRFBoQMFpo7rAXSMkflznTf7593u3Gfj27AiUG wtCnzmIndP4xGuGghYeU/+4XeQxPi5wwvdx4JwRD3nEqZpt7WWAr3mrqBtg0OSnap4 SL+AjlNhISfZ8xdjx44f5vthAqXMTNL881BU1eVw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733118AbfDARaf (ORCPT ); Mon, 1 Apr 2019 13:30:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:37616 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728698AbfDARac (ORCPT ); Mon, 1 Apr 2019 13:30:32 -0400 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 D26922070B; Mon, 1 Apr 2019 17:30:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554139832; bh=YKrF8HsqFixDd71eOLAmxLe+ICN442VSNKKpH2ueAC4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ulIp7TgFWmgpEH2WHexNa3Dnrwaf32a5qzWZY97bnjokyB+CYvqF5kH71HrX9llU3 GHRZNurKb6IP644QM1jVTPlX4mQ6T/boXX7ix+HS5tEWVg51JZ1FNYqQhaKpLoefS/ 7h83qahs55Rig3OAR7nu+smeX357nk4wEs2V2aRM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Baolin Wang , Felipe Balbi , Arnd Bergmann Subject: [PATCH 4.4 027/131] usb: gadget: Add the gserial port checking in gs_start_tx() Date: Mon, 1 Apr 2019 19:01:37 +0200 Message-Id: <20190401170054.338704490@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190401170051.645954551@linuxfoundation.org> References: <20190401170051.645954551@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Baolin Wang commit 511a36d2f357724312bb3776d2f6eed3890928b2 upstream. When usb gadget is set gadget serial function, it will be crash in below situation. It will clean the 'port->port_usb' pointer in gserial_disconnect() function when usb link is inactive, but it will release lock for disabling the endpoints in this function. Druing the lock release period, it maybe complete one request to issue gs_write_complete()--->gs_start_tx() function, but the 'port->port_usb' pointer had been set NULL, thus it will be crash in gs_start_tx() function. This patch adds the 'port->port_usb' pointer checking in gs_start_tx() function to avoid this situation. Signed-off-by: Baolin Wang Signed-off-by: Felipe Balbi Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/u_serial.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/usb/gadget/function/u_serial.c +++ b/drivers/usb/gadget/function/u_serial.c @@ -361,10 +361,15 @@ __acquires(&port->port_lock) */ { struct list_head *pool = &port->write_pool; - struct usb_ep *in = port->port_usb->in; + struct usb_ep *in; int status = 0; bool do_tty_wake = false; + if (!port->port_usb) + return status; + + in = port->port_usb->in; + while (!port->write_busy && !list_empty(pool)) { struct usb_request *req; int len;