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USB: mct_u232: add sanity checking in probe 

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 <ONeukum@suse.com>
CC: stable@vger.kernel.org
[johan: add error message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Oliver Neukum 2016-03-31 12:04:24 -04:00 committed by Willy Tarreau
parent 1b282e30c7
commit ffb372d838
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/serial/mct_u232.c
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@ -377,14 +377,21 @@ static void mct_u232_msr_to_state(struct usb_serial_port *port,
static int mct_u232_port_probe(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct mct_u232_private *priv;
/* 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(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* Use second interrupt-in endpoint for reading. */
priv->read_urb = port->serial->port[1]->interrupt_in_urb;
priv->read_urb = serial->port[1]->interrupt_in_urb;
priv->read_urb->context = port;
spin_lock_init(&priv->lock);