Fix another NULL-pointer dereference at open should a malicious device
lack an interrupt-in endpoint.
Note that the driver has a broken check for an interrupt-in endpoint,
which means that an interrupt URB has never even been submitted.
Fixes: 3f5429746d91 ("USB: Moschip 7840 USB-Serial Driver")
Cc: stable <stable@xxxxxxxxxxxxxxx> # v2.6.19: 5c75633ef751
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/mos7840.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index d1b92f582478..3821c53fcee9 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1034,6 +1034,7 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
* (can't set it up in mos7840_startup as the structures *
* were not set up at that time.) */
if (port0->open_ports == 1) {
+ /* FIXME: Buffer never NULL, so URB is not submitted. */
if (serial->port[0]->interrupt_in_buffer == NULL) {
/* set up interrupt urb */
usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
@@ -2116,7 +2117,8 @@ static int mos7840_calc_num_ports(struct usb_serial *serial)
static int mos7840_attach(struct usb_serial *serial)
{
if (serial->num_bulk_in < serial->num_ports ||
- serial->num_bulk_out < serial->num_ports) {
+ serial->num_bulk_out < serial->num_ports ||
+ serial->num_interrupt_in < 1) {
dev_err(&serial->interface->dev, "missing endpoints\n");
return -ENODEV;
}
--
2.10.2
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