isdn/gigaset: fix NULL-deref at probe

Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints.

direct USB connection")
Cc: stable <[email protected]> # 2.6.17
Cc: Hansjoerg Lipp <[email protected]>

---
 drivers/isdn/gigaset/bas-gigaset.c | 3 +++
 1 file changed, 3 insertions(+)

index 11e13c56126f..2da3ff650e1d 100644
@@ -2317,6 +2317,9 @@ static int gigaset_probe(struct usb_interface *interface,
 		return -ENODEV;
 	}
 
+	if (hostif->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	dev_info(&udev->dev,
 		 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
 		 __func__, le16_to_cpu(udev->descriptor.idVendor),

2.12.0

From: Johan Hovold <[email protected]>
Date: Mon, 13 Mar 2017 13:39:01 +0100

Applied.
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