isdn/gigaset: fix NULL-deref at probe
authorJohan Hovold <johan@kernel.org>
Mon, 13 Mar 2017 12:39:01 +0000 (13:39 +0100)
committerDavid S. Miller <davem@davemloft.net>
Mon, 13 Mar 2017 19:28:40 +0000 (12:28 -0700)
Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: cf7776dc05b8 ("[PATCH] isdn4linux: Siemens Gigaset drivers -
direct USB connection")
Cc: stable <stable@vger.kernel.org> # 2.6.17
Cc: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/isdn/gigaset/bas-gigaset.c

index 11e13c56126fba31fca9c59d66252ffeced55c8a..2da3ff650e1d550cc50fd8572156ddd1cabd7961 100644 (file)
@@ -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),