Commit 5a07975a authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman

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/61Signed-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
...@@ -1251,8 +1251,27 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num) ...@@ -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) static int digi_startup(struct usb_serial *serial)
{ {
struct device *dev = &serial->interface->dev;
struct digi_serial *serial_priv; struct digi_serial *serial_priv;
int ret; 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); serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
if (!serial_priv) if (!serial_priv)
......
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