Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758849AbaGXKMA (ORCPT ); Thu, 24 Jul 2014 06:12:00 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:54861 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934502AbaGXJrt (ORCPT ); Thu, 24 Jul 2014 05:47:49 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Johan Hovold , Luis Henriques Subject: [PATCH 3.11 059/128] USB: ftdi_sio: fix null deref at port probe Date: Thu, 24 Jul 2014 10:45:08 +0100 Message-Id: <1406195177-8656-60-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1406195177-8656-1-git-send-email-luis.henriques@canonical.com> References: <1406195177-8656-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.11.10.14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit aea1ae8760314e072bf1b773521e9de5d5dda10d upstream. Fix NULL-pointer dereference when probing an interface with no endpoints. These devices have two bulk endpoints per interface, but this avoids crashing the kernel if a user forces a non-FTDI device to be probed. Note that the iterator variable was made unsigned in order to avoid a maybe-uninitialized compiler warning for ep_desc after the loop. Fixes: 895f28badce9 ("USB: ftdi_sio: fix hi-speed device packet size calculation") Reported-by: Mike Remski Tested-by: Mike Remski Signed-off-by: Johan Hovold Signed-off-by: Luis Henriques --- drivers/usb/serial/ftdi_sio.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index b9e663ac9a35..3e315de9bbd4 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1577,14 +1577,17 @@ static void ftdi_set_max_packet_size(struct usb_serial_port *port) struct usb_device *udev = serial->dev; struct usb_interface *interface = serial->interface; - struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc; + struct usb_endpoint_descriptor *ep_desc; unsigned num_endpoints; - int i; + unsigned i; num_endpoints = interface->cur_altsetting->desc.bNumEndpoints; dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints); + if (!num_endpoints) + return; + /* NOTE: some customers have programmed FT232R/FT245R devices * with an endpoint size of 0 - not good. In this case, we * want to override the endpoint descriptor setting and use a -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/