[PATCH 3.16 167/370] USB: serial: mos7840: fix NULL-deref at open

Ben Hutchings
2017-03-10T12:12:57Z

From: Johan Hovold <johan@kernel.org>

commit 5c75633ef751dd4cd8f443dc35152c1ae563162e upstream.

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 mos7840_open+0x88/0x8dc [mos7840]

Note that we continue to treat the interrupt-in endpoint as optional for
now.

Fixes: 3f5429746d91 ("USB: Moschip 7840 USB-Serial Driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/usb/serial/mos7840.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -2179,6 +2179,17 @@ static int mos7840_calc_num_ports(struct
return mos7840_num_ports;
}

+static int mos7840_attach(struct usb_serial *serial)
+{
+ if (serial->num_bulk_in < serial->num_ports ||
+ serial->num_bulk_out < serial->num_ports) {
+ dev_err(&serial->interface->dev, "missing endpoints\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
static int mos7840_port_probe(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
@@ -2457,6 +2468,7 @@ static struct usb_serial_driver moschip7
.tiocmset = mos7840_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
+ .attach = mos7840_attach,
.port_probe = mos7840_port_probe,
.port_remove = mos7840_port_remove,
.read_bulk_callback = mos7840_bulk_in_callback,