USB: fix oops in cdc-wdm in case of malformed descriptors

cdc-wdm needs to ignore extremely malformed descriptors.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 3771d6e6d0cc..34e6108e1d42 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -652,7 +652,7 @@ next_desc:
 
         iface = &intf->altsetting[0];
         ep = &iface->endpoint[0].desc;
-        if (!usb_endpoint_is_int_in(ep)) {
+        if (!ep || !usb_endpoint_is_int_in(ep)) {
                 rv = -EINVAL;
                 goto err;
         }