An attack using missing endpoints exists.
CVE-2016-3137
Signed-off-by: Oliver Neukum <ONeukum@xxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx
v1 - add sanity check
v2 - add error logging
v3 - correct error message
---
drivers/usb/serial/cypress_m8.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 01bf533..5e25443 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -447,6 +447,11 @@ static int cypress_generic_port_probe(struct usb_serial_port *port)
struct usb_serial *serial = port->serial;
struct cypress_private *priv;
+ if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
+ dev_err(&port->dev, "A required endpoint is missing\n");
+ return -ENODEV;
+ }
+
priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -606,12 +611,6 @@ static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
cypress_set_termios(tty, port, &priv->tmp_termios);
/* setup the port and start reading from the device */
- if (!port->interrupt_in_urb) {
- dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
- __func__);
- return -1;
- }
-
usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer,
--
2.1.4
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