patch "USB: serial: mos7840: fix another NULL-deref at open" added to usb-testing

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

USB: serial: mos7840: fix another NULL-deref at open

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-testing 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 be merged to the usb-next branch sometime soon, after it passes testing, and the merge window is open.

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

From: Johan Hovold <[email protected]>
Date: Thu, 9 Feb 2017 12:11:41 +0100
Subject: USB: serial: mos7840: fix another NULL-deref at open

Fix another NULL-pointer dereference at open should a malicious device lack an interrupt-in endpoint.

Note that the driver has a broken check for an interrupt-in endpoint which means that an interrupt URB has never even been submitted.

---
 drivers/usb/serial/mos7840.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

index d1b92f582478..3821c53fcee9 100644
@@ -1034,6 +1034,7 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 	 * (can't set it up in mos7840_startup as the structures *
 	 * were not set up at that time.)                        */
 	if (port0->open_ports == 1) {
+		/* FIXME: Buffer never NULL, so URB is not submitted. */
 		if (serial->port[0]->interrupt_in_buffer == NULL) {
 			/* set up interrupt urb */
 			usb_fill_int_urb(serial->port[0]->interrupt_in_urb,

@@ -2116,7 +2117,8 @@ static int mos7840_calc_num_ports(struct usb_serial *serial)
 static int mos7840_attach(struct usb_serial *serial)
 {
 	if (serial->num_bulk_in < serial->num_ports ||
-			serial->num_bulk_out < serial->num_ports) {
+			serial->num_bulk_out < serial->num_ports ||
+			serial->num_interrupt_in < 1) {
 		dev_err(&serial->interface->dev, "missing endpoints\n");
 		return -ENODEV;
 	}

2.11.1