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,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 3AA4FC2D0DB for ; Wed, 22 Jan 2020 09:32:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04A4A24673 for ; Wed, 22 Jan 2020 09:32:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579685525; bh=54W6OgmCDqeTuJsLiKooVfT40af7XsuLNWDViJLgAhU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wyrjYiFPMr/KhAIAItu1wtPMehVluGEWIFELZizWQdWrg9ls3/h28e/910Pn5/loq xKCLHH/yTxXnpGaASUUyCpbhTabuVPgs2OWVNxFRlOmEMeYzy6vkd1X/F0utbtCBOF 3YryIvbNM3c01yCM0AWFKhzX/WuIFqVRt70qXz/U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729335AbgAVJcE (ORCPT ); Wed, 22 Jan 2020 04:32:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:44496 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729935AbgAVJcB (ORCPT ); Wed, 22 Jan 2020 04:32:01 -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 C3FD724673; Wed, 22 Jan 2020 09:31:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579685520; bh=54W6OgmCDqeTuJsLiKooVfT40af7XsuLNWDViJLgAhU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=t0ZIq6iibEjdqT6OWWZL+XhdQ6skU3hwYjYMF21ynOI+g+67cWgZSz1VYEiBLBQ6/ qsjwMxpwqAQ3+ZahDAXAetlcVZWKd+cSVLM0jTECVvDSnSVgWQy6WK66PIZTd/s0Dk cBEhd+3aEMFWOj3BkEDc2mMd9xZs/PdGWjR+By04= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 4.4 48/76] USB: serial: quatech2: handle unbound ports Date: Wed, 22 Jan 2020 10:29:04 +0100 Message-Id: <20200122092757.863621015@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200122092751.587775548@linuxfoundation.org> References: <20200122092751.587775548@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: Johan Hovold commit 9715a43eea77e42678a1002623f2d9a78f5b81a1 upstream. Check for NULL port data in the modem- and line-status handlers to avoid dereferencing a NULL pointer in the unlikely case where a port device isn't bound to a driver (e.g. after an allocation failure on port probe). Note that the other (stubbed) event handlers qt2_process_xmit_empty() and qt2_process_flush() would need similar sanity checks in case they are ever implemented. Fixes: f7a33e608d9a ("USB: serial: add quatech2 usb to serial driver") Cc: stable # 3.5 Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/quatech2.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/usb/serial/quatech2.c +++ b/drivers/usb/serial/quatech2.c @@ -872,7 +872,10 @@ static void qt2_update_msr(struct usb_se u8 newMSR = (u8) *ch; unsigned long flags; + /* May be called from qt2_process_read_urb() for an unbound port. */ port_priv = usb_get_serial_port_data(port); + if (!port_priv) + return; spin_lock_irqsave(&port_priv->lock, flags); port_priv->shadowMSR = newMSR; @@ -900,7 +903,10 @@ static void qt2_update_lsr(struct usb_se unsigned long flags; u8 newLSR = (u8) *ch; + /* May be called from qt2_process_read_urb() for an unbound port. */ port_priv = usb_get_serial_port_data(port); + if (!port_priv) + return; if (newLSR & UART_LSR_BI) newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);