[PATCH net] hso: fix NULL-deref on tty open

[Johan Hovold]

Fix NULL-pointer dereference on tty open due to a failure to handle a
missing interrupt-in endpoint when probing modem ports:

        BUG: kernel NULL pointer dereference, address: 0000000000000006
        ...
        RIP: 0010:tiocmget_submit_urb+0x1c/0xe0 [hso]
        ...
        Call Trace:
        hso_start_serial_device+0xdc/0x140 [hso]
        hso_serial_open+0x118/0x1b0 [hso]
        tty_open+0xf1/0x490

Fixes: 542f54823614 ("tty: Modem functions for the HSO driver")
Signed-off-by: Johan Hovold <jo...@kernel.org>
---
 drivers/net/usb/hso.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index ce78714f536f..a505b2ab88b8 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2620,14 +2620,18 @@ static struct hso_device *hso_create_bulk_serial_device(
                 */
                if (serial->tiocmget) {
                        tiocmget = serial->tiocmget;
+                       tiocmget->endp = hso_get_ep(interface,
+                                                   USB_ENDPOINT_XFER_INT,
+                                                   USB_DIR_IN);
+                       if (!tiocmget->endp) {
+                               dev_err(&interface->dev, "Failed to find INT IN 
ep\n");
+                               goto exit;
+                       }
+
                        tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
                        if (tiocmget->urb) {
                                mutex_init(&tiocmget->mutex);
                                init_waitqueue_head(&tiocmget->waitq);
-                               tiocmget->endp = hso_get_ep(
-                                       interface,
-                                       USB_ENDPOINT_XFER_INT,
-                                       USB_DIR_IN);
                        } else
                                hso_free_tiomget(serial);
                }
-- 
2.23.0