Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935449AbaDJEGj (ORCPT ); Thu, 10 Apr 2014 00:06:39 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:41124 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934819AbaDJDWZ (ORCPT ); Wed, 9 Apr 2014 23:22:25 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Ben Hutchings , Yang Yingliang Subject: [PATCH 3.4 062/134] USB: io_edgeport: fix use-after-free in TIOCMIWAIT Date: Wed, 9 Apr 2014 20:22:58 -0700 Message-Id: <20140410032308.045542104@linuxfoundation.org> X-Mailer: git-send-email 1.9.0 In-Reply-To: <20140410032259.587501440@linuxfoundation.org> References: <20140410032259.587501440@linuxfoundation.org> User-Agent: quilt/0.60-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 333576255d4cfc53efd056aad438568184b36af6 upstream. Use the port wait queue and make sure to check the serial disconnected flag before accessing private port data after waking up. This is is needed as the private port data (including the wait queue itself) can be gone when waking up after a disconnect. Signed-off-by: Johan Hovold Signed-off-by: Ben Hutchings Cc: Yang Yingliang Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/io_edgeport.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) --- a/drivers/usb/serial/io_edgeport.c +++ b/drivers/usb/serial/io_edgeport.c @@ -114,7 +114,6 @@ struct edgeport_port { wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */ wait_queue_head_t wait_open; /* for handling sleeping while waiting for open to finish */ wait_queue_head_t wait_command; /* for handling sleeping while waiting for command to finish */ - wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */ struct async_icount icount; struct usb_serial_port *port; /* loop back to the owner of this object */ @@ -884,7 +883,6 @@ static int edge_open(struct tty_struct * /* initialize our wait queues */ init_waitqueue_head(&edge_port->wait_open); init_waitqueue_head(&edge_port->wait_chase); - init_waitqueue_head(&edge_port->delta_msr_wait); init_waitqueue_head(&edge_port->wait_command); /* initialize our icount structure */ @@ -1701,13 +1699,17 @@ static int edge_ioctl(struct tty_struct dbg("%s (%d) TIOCMIWAIT", __func__, port->number); cprev = edge_port->icount; while (1) { - prepare_to_wait(&edge_port->delta_msr_wait, + prepare_to_wait(&port->delta_msr_wait, &wait, TASK_INTERRUPTIBLE); schedule(); - finish_wait(&edge_port->delta_msr_wait, &wait); + finish_wait(&port->delta_msr_wait, &wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; + + if (port->serial->disconnected) + return -EIO; + cnow = edge_port->icount; if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) @@ -2088,7 +2090,7 @@ static void handle_new_msr(struct edgepo icount->dcd++; if (newMsr & EDGEPORT_MSR_DELTA_RI) icount->rng++; - wake_up_interruptible(&edge_port->delta_msr_wait); + wake_up_interruptible(&edge_port->port->delta_msr_wait); } /* Save the new modem status */ -- 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/