UPSTREAM: USB: gadget: validate interface OS descriptor requests

Stall the control endpoint in case provided index exceeds array size of
MAX_CONFIG_INTERFACES or when the retrieved function pointer is null.

Bug: 213172319
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 75e5b4849b81e19e9efe1654b30d7f3151c33c2c)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I78f46b6f2140394a6bc6cff9f829c0742d7ad2fc

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 3789c329..553382c 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c

@@ -1975,6 +1975,9 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 				if (w_index != 0x5 || (w_value >> 8))
 					break;
 				interface = w_value & 0xFF;
+				if (interface >= MAX_CONFIG_INTERFACES ||
+				    !os_desc_cfg->interface[interface])
+					break;
 				buf[6] = w_index;
 				count = count_ext_prop(os_desc_cfg,
 					interface);