Patch "USB: serial: console: fix use-after-free on disconnect" has been added to the 4.13-stable tree

Patch "USB: serial: console: fix use-after-free on disconnect" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: serial: console: fix use-after-free on disconnect

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-serial-console-fix-use-after-free-on-disconnect.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From bd998c2e0df0469707503023d50d46cf0b10c787 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 4 Oct 2017 11:01:12 +0200
Subject: USB: serial: console: fix use-after-free on disconnect

From: Johan Hovold <johan@kernel.org>

commit bd998c2e0df0469707503023d50d46cf0b10c787 upstream.

A clean-up patch removing two redundant NULL-checks from the console
disconnect handler inadvertently also removed a third check. This could
lead to the struct usb_serial being prematurely freed by the console
code when a driver accepts but does not register any ports for an
interface which also lacks endpoint descriptors.

Fixes: 0e517c93dc02 ("USB: serial: console: clean up sanity checks")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/serial/console.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -265,7 +265,7 @@ static struct console usbcons = {
 
 void usb_serial_console_disconnect(struct usb_serial *serial)
 {
-	if (serial->port[0] == usbcons_info.port) {
+	if (serial->port[0] && serial->port[0] == usbcons_info.port) {
 		usb_serial_console_exit();
 		usb_serial_put(serial);
 	}


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.13/usb-serial-console-fix-use-after-free-on-disconnect.patch
queue-4.13/alsa-caiaq-fix-stray-urb-at-probe-error-path.patch
queue-4.13/usb-serial-cp210x-fix-partnum-regression.patch
queue-4.13/usb-serial-option-add-support-for-tp-link-lte-module.patch
queue-4.13/usb-serial-cp210x-add-support-for-elv-tfd500.patch
queue-4.13/usb-serial-qcserial-add-dell-dw5818-dw5819.patch
queue-4.13/usb-serial-console-fix-use-after-free-after-failed-setup.patch
queue-4.13/usb-serial-ftdi_sio-add-id-for-cypress-wiced-dev-board.patch