[PATCH 3.2 064/115] USB: mct_u232: add sanity checking in probe

[Ben Hutchings]

3.2.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Oliver Neukum <oneu...@suse.com>

commit 4e9a0b05257f29cf4b75f3209243ed71614d062e upstream.

An attack using the lack of sanity checking in probe is known. This
patch checks for the existence of a second port.

CVE-2016-3136

Signed-off-by: Oliver Neukum <oneu...@suse.com>
[johan: add error message ]
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
[bwh: Backported to 3.2: put the check in mct_u232_startup(), which already
 has a 'serial' variable]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -443,6 +443,12 @@ static int mct_u232_startup(struct usb_s
        struct mct_u232_private *priv;
        struct usb_serial_port *port, *rport;
 
+       /* check first to simplify error handling */
+       if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) {
+               dev_err(&port->dev, "expected endpoint missing\n");
+               return -ENODEV;
+       }
+
        priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;