patch "USB: serial: io_ti: fix information leak in completion handler" added to usb-linus

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 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: Mon, 6 Mar 2017 17:36:40 +0100
Subject: USB: serial: io_ti: fix information leak in completion handler

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(-)

index 4561dd4cde8b..a76b95d32157 100644
@@ -1761,7 +1761,7 @@ static void edge_bulk_in_callback(struct urb *urb)
 
 	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);

2.12.0