usb: net: sierra: check for no status endpoint

The driver checks for having three endpoints and
having bulk in and out endpoints, but not that
the third endpoint is interrupt input.
Rectify the omission.

Reported-by: [email protected]
Closes: https://lore.kernel.org/linux-usb/[email protected]/
Tested-by: [email protected]
Fixes: eb4fd8c ("net/usb: add sierra_net.c driver")
Signed-off-by: Oliver Neukum <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: oneukum

drivers/net/usb/sierra_net.c

@@ -689,6 +689,10 @@ static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
 			status);
 		return -ENODEV;
 	}
+	if (!dev->status) {
+		dev_err(&dev->udev->dev, "No status endpoint found");
+		return -ENODEV;
+	}
 	/* Initialize sierra private data */
 	priv = kzalloc(sizeof *priv, GFP_KERNEL);
 	if (!priv)