Patch "USB: serial: io_ti: fix information leak in completion handler" has been added to the 4.10-stable tree

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

USB: serial: io_ti: fix information leak in completion handler

to the 4.10-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-information-leak-in-completion-handler.patch
and it can be found in the queue-4.10 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: Mon, 6 Mar 2017 17:36:40 +0100
Subject: USB: serial: io_ti: fix information leak in completion handler

From: Johan Hovold <[email protected]>

commit 654b404f2a222f918af9b0cd18ad469d0c941a8e upstream.

Add missing sanity check to the bulk-in completion handler to avoid an integer underflow that can be triggered by a malicious device.

This avoids leaking 128 kB of memory content from after the URB transfer buffer to user space.

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

@@ -1761,7 +1761,7 @@ static void edge_bulk_in_callback(struct
 
 	port_number = edge_port->port->port_number;
 
-	if (edge_port->lsr_event) {
+	if (urb->actual_length > 0 && edge_port->lsr_event) {
 		edge_port->lsr_event = 0;
 		dev_dbg(dev, "%s ===== Port %u LSR Status = %02x, Data = %02x ======\n",
 			__func__, port_number, edge_port->lsr_mask, *data);

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

queue-4.10/usb-serial-digi_acceleport-fix-oob-event-processing.patch queue-4.10/usb-serial-omninet-fix-reference-leaks-at-open.patch queue-4.10/usb-serial-digi_acceleport-fix-oob-data-sanity-check.patch queue-4.10/usb-iowarrior-fix-null-deref-in-write.patch queue-4.10/usb-iowarrior-fix-null-deref-at-probe.patch queue-4.10/usb-serial-io_ti-fix-null-deref-in-interrupt-callback.patch queue-4.10/usb-serial-io_ti-fix-information-leak-in-completion-handler.patch queue-4.10/usb-serial-safe_serial-fix-information-leak-in-completion-handler.patch