patch "USB: serial: console: fix use-after-free on disconnect" added to usb-linus

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 my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Johan Hovold <[email protected]>
Date: Wed, 4 Oct 2017 11:01:12 +0200
Subject: USB: serial: console: fix use-after-free on disconnect

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.

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

index fdf89800ebc3..ed8ba3ef5c79 100644
@@ -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);
 	}

2.14.2