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Commit 5a07975a authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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USB: digi_acceleport: do sanity checking for the number of ports 

The driver can be crashed with devices that expose crafted descriptors
with too few endpoints.

See: http://seclists.org/bugtraq/2016/Mar/61



Signed-off-by: default avatarOliver Neukum <ONeukum@suse.com>
[johan: fix OOB endpoint check and add error messages ]
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c55aee1b

drivers/usb/serial/digi_acceleport.c

+19 −0
Original line number Diff line number Diff line
@@ -1251,8 +1251,27 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num) 


static int digi_startup(struct usb_serial *serial)

{

	struct device *dev = &serial->interface->dev;

	struct digi_serial *serial_priv;

	int ret;

	int i;



	/* check whether the device has the expected number of endpoints */

	if (serial->num_port_pointers < serial->type->num_ports + 1) {

		dev_err(dev, "OOB endpoints missing\n");

		return -ENODEV;

	}



	for (i = 0; i < serial->type->num_ports + 1 ; i++) {

		if (!serial->port[i]->read_urb) {

			dev_err(dev, "bulk-in endpoint missing\n");

			return -ENODEV;

		}

		if (!serial->port[i]->write_urb) {

			dev_err(dev, "bulk-out endpoint missing\n");

			return -ENODEV;

		}

	}



	serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);

	if (!serial_priv)