USB: lvtest: fix NULL-deref at probe

commit 1dc56c52d2484be09c7398a5207d6b11a4256be9 upstream.

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

Note that this driver does not bind to any devices by default.

Fixes: ce21bfe603b3 ("USB: Add LVS Test device driver")
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/misc/lvstest.c b/drivers/usb/misc/lvstest.c
index 62cb8cd08403d8a5290f213b41b7400ace0b9ca9..66e2d036bb37fe72cfcc02663e68bca86a522b4b 100644 (file)
--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -370,6 +370,10 @@ static int lvs_rh_probe(struct usb_interface *intf,
 
        hdev = interface_to_usbdev(intf);
        desc = intf->cur_altsetting;
+
+       if (desc->desc.bNumEndpoints < 1)
+               return -ENODEV;
+
        endpoint = &desc->endpoint[0].desc;
 
        /* valid only for SS root hub */