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USB: cypress_m8: add endpoint sanity check

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An attack using missing endpoints exists.

CVE-2016-3137

Change-Id: Id6ca1e8b69abcccdc13acbedbe2189b69a8cc569
Signed-off-by: Oliver Neukum <ONeukum@suse.com>
CC: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2016-03-31 12:04:25 -04:00 committed by Flex1911
parent 4ff82c7b6e
commit 00e518a71e
1 changed files with 5 additions and 6 deletions
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11
drivers/usb/serial/cypress_m8.c
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@ -453,6 +453,11 @@ static int generic_startup(struct usb_serial *serial)
dbg("%s - port %d", __func__, port->number);
if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
dev_err(&port->dev, "required endpoint is missing\n");
return -ENODEV;
}
priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@ -619,12 +624,6 @@ 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,