Patch "USB: serial: io_ti: fix NULL-deref at open" has been added to the 4.4-stable tree

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

USB: serial: io_ti: fix NULL-deref at open

to the 4.4-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-io_ti-fix-null-deref-at-open.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Johan Hovold <[email protected]>
Date: Tue, 3 Jan 2017 16:39:43 +0100
Subject: USB: serial: io_ti: fix NULL-deref at open

From: Johan Hovold <[email protected]>

commit a323fefc6f5079844dc62ffeb54f491d0242ca35 upstream.

Fix NULL-pointer dereference when clearing halt at open should a malicious device lack the expected endpoints when in download mode.

Unable to handle kernel NULL pointer dereference at virtual address 00000030

...
[<bf011ed8>] (edge_open [io_ti]) from [<bf000118>] (serial_port_activate+0x68/0x98 [usbserial]) [<bf000118>] (serial_port_activate [usbserial]) from [<c0470ca4>] (tty_port_open+0x9c/0xe8) [<c0470ca4>] (tty_port_open) from [<bf000da0>] (serial_open+0x48/0x6c [usbserial]) [<bf000da0>] (serial_open [usbserial]) from [<c0469178>] (tty_open+0xcc/0x5cc)

---
 drivers/usb/serial/io_ti.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -2549,6 +2549,13 @@ static int edge_startup(struct usb_seria
 	int status;
 	u16 product_id;
 
+	/* Make sure we have the required endpoints when in download mode. */
+	if (serial->interface->cur_altsetting->desc.bNumEndpoints > 1) {
+		if (serial->num_bulk_in < serial->num_ports ||
+				serial->num_bulk_out < serial->num_ports)
+			return -ENODEV;
+	}
+
 	/* create our private serial structure */
 	edge_serial = kzalloc(sizeof(struct edgeport_serial), GFP_KERNEL);
 	if (!edge_serial)

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/usb-serial-io_ti-fix-i-o-after-disconnect.patch queue-4.4/usb-serial-ti_usb_3410_5052-fix-null-deref-at-open.patch queue-4.4/usb-serial-kobil_sct-fix-null-deref-in-write.patch queue-4.4/usb-serial-spcp8x5-fix-null-deref-at-open.patch queue-4.4/usb-serial-mos7720-fix-parallel-probe.patch queue-4.4/usb-serial-cyberjack-fix-null-deref-at-open.patch queue-4.4/usb-serial-mos7720-fix-null-deref-at-open.patch queue-4.4/usb-serial-garmin_gps-fix-memory-leak-on-failed-urb-submit.patch queue-4.4/usb-serial-io_ti-fix-null-deref-at-open.patch queue-4.4/usb-serial-pl2303-fix-null-deref-at-open.patch queue-4.4/usb-serial-quatech2-fix-sleep-while-atomic-in-close.patch queue-4.4/usb-serial-iuu_phoenix-fix-null-deref-at-open.patch queue-4.4/usb-serial-oti6858-fix-null-deref-at-open.patch queue-4.4/usb-serial-io_edgeport-fix-null-deref-at-open.patch queue-4.4/usb-serial-mos7720-fix-parport-use-after-free-on-probe-errors.patch queue-4.4/usb-serial-mos7720-fix-use-after-free-on-probe-errors.patch queue-4.4/usb-serial-mos7840-fix-null-deref-at-open.patch queue-4.4/usb-serial-omninet-fix-null-derefs-at-open-and-disconnect.patch queue-4.4/usb-serial-keyspan_pda-verify-endpoints-at-probe.patch queue-4.4/usb-serial-io_ti-fix-another-null-deref-at-open.patch