[PATCH 3.18 130/145] USB: lvtest: fix NULL-deref at probe

Greg Kroah-Hartman
2017-04-16T11:03:26Z

From: Johan Hovold <johan@kernel.org>

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>

---
drivers/usb/misc/lvstest.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -370,6 +370,10 @@ static int lvs_rh_probe(struct usb_inter

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 */