[PATCH] cypress_m8: add sanity checking

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An attack using missing endpoints exists.
CVE-2016-3137

Signed-off-by: Oliver Neukum <ONeukum@xxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx
---
 drivers/usb/serial/cypress_m8.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 01bf533..1c6cbf5 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -447,6 +447,9 @@ 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)
+		return -ENODEV;
+
 	priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.1.4

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