--- zzzz-none-000/linux-3.10.107/drivers/net/usb/qmi_wwan.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/net/usb/qmi_wwan.c	2021-11-10 11:53:55.000000000 +0000
@@ -235,7 +235,8 @@
 	info->data = intf;
 
 	/* and a number of CDC descriptors */
-	while (len > 3) {
+	/* == 20180119 AVM/WKR cdc parse security ported from cdc_ncm driver ==*/
+	while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
 		struct usb_descriptor_header *h = (void *)buf;
 
 		/* ignore any misplaced descriptors */