Commit f41f108a authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

USB: serial: spcp8x5: fix NULL-deref at open

[ Upstream commit cc090924 ]

Fix NULL-pointer dereference in open() should the device lack the
expected endpoints:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at spcp8x5_open+0x30/0xd0 [spcp8x5]

Fixes: 619a6f1d ("USB: add usb-serial spcp8x5 driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 17afc4c8
......@@ -154,6 +154,19 @@ static int spcp8x5_probe(struct usb_serial *serial,
return 0;
}
static int spcp8x5_attach(struct usb_serial *serial)
{
unsigned char num_ports = serial->num_ports;
if (serial->num_bulk_in < num_ports ||
serial->num_bulk_out < num_ports) {
dev_err(&serial->interface->dev, "missing endpoints\n");
return -ENODEV;
}
return 0;
}
static int spcp8x5_port_probe(struct usb_serial_port *port)
{
const struct usb_device_id *id = usb_get_serial_data(port->serial);
......@@ -477,6 +490,7 @@ static struct usb_serial_driver spcp8x5_device = {
.tiocmget = spcp8x5_tiocmget,
.tiocmset = spcp8x5_tiocmset,
.probe = spcp8x5_probe,
.attach = spcp8x5_attach,
.port_probe = spcp8x5_port_probe,
.port_remove = spcp8x5_port_remove,
};
......
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