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 5CB43C5ACCC for ; Thu, 18 Oct 2018 18:06:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 251E120658 for ; Thu, 18 Oct 2018 18:06:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="quR4fDo2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 251E120658 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730561AbeJSCIz (ORCPT ); Thu, 18 Oct 2018 22:08:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:58144 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729926AbeJSCIy (ORCPT ); Thu, 18 Oct 2018 22:08:54 -0400 Received: from localhost (ip-213-127-77-176.ip.prioritytelecom.net [213.127.77.176]) (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 31D3E2148D; Thu, 18 Oct 2018 18:06:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1539886007; bh=10ZxONM01KTTzfcJEaLscfeJ4CrzGFLkir2HeyntUf0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=quR4fDo2udpA/6Sc1wHXgwwxaT56UBIHF0/g3amydHhChlGji9wW9s8rRxjFB8zAt It5KuI7m1YkmXv+XMmZkKA64tUhpBxKiuORrfP/jDeBy45/xD8hDg7rmX6t6FloFnn cY8Ug4tikKqhi6qZeQMOkdasMcK0DuSW/ly/dMVI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephen Warren , Felipe Balbi , Krzysztof Kozlowski Subject: [PATCH 4.4 44/48] usb: gadget: serial: fix oops when data rxd after close Date: Thu, 18 Oct 2018 19:55:19 +0200 Message-Id: <20181018175430.254334473@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181018175427.133690306@linuxfoundation.org> References: <20181018175427.133690306@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review 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: Stephen Warren commit daa35bd95634a2a2d72d1049c93576a02711cb1a upstream. When the gadget serial device has no associated TTY, do not pass any received data into the TTY layer for processing; simply drop it instead. This prevents the TTY layer from calling back into the gadget serial driver, which will then crash in e.g. gs_write_room() due to lack of gadget serial device to TTY association (i.e. a NULL pointer dereference). Signed-off-by: Stephen Warren Signed-off-by: Felipe Balbi Signed-off-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/u_serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/gadget/function/u_serial.c +++ b/drivers/usb/gadget/function/u_serial.c @@ -518,7 +518,7 @@ static void gs_rx_push(unsigned long _po } /* push data to (open) tty */ - if (req->actual) { + if (req->actual && tty) { char *packet = req->buf; unsigned size = req->actual; unsigned n;