isdn/gigaset: fix NULL-deref at probe

commit 68c32f9c2a36d410aa242e661506e5b2c2764179 upstream.

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: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/isdn/gigaset/bas-gigaset.c b/drivers/isdn/gigaset/bas-gigaset.c
index aecec6d3246370004a0e9434a1f58303e96b7c46..7f1c625b08ec8d61752aa9b6ef9f547625e56d97 100644 (file)
--- a/drivers/isdn/gigaset/bas-gigaset.c
+++ b/drivers/isdn/gigaset/bas-gigaset.c
@@ -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),