linux-kernel - [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup

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Date:   Wed,  4 Oct 2017 11:01:13 +0200
From:   Johan Hovold <johan@...nel.org>
To:     linux-usb@...r.kernel.org
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>
Subject: [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup

Make sure to reset the USB-console port pointer when console setup fails
in order to avoid having the struct usb_serial be prematurely freed by
the console code when the device is later disconnected.

Fixes: 73e487fdb75f ("[PATCH] USB console: fix disconnection issues")
Cc: stable <stable@...r.kernel.org>	# 2.6.18
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/console.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index ed8ba3ef5c79..43a862a90a77 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -186,6 +186,7 @@ static int usb_console_setup(struct console *co, char *options)
 	tty_kref_put(tty);
  reset_open_count:
 	port->port.count = 0;
+	info->port = NULL;
 	usb_autopm_put_interface(serial->interface);
  error_get_interface:
 	usb_serial_put(serial);
-- 
2.14.2