--- zzzz-none-000/linux-3.10.107/drivers/net/usb/cdc_ether.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/net/usb/cdc_ether.c	2021-11-10 11:53:55.000000000 +0000
@@ -128,7 +128,10 @@
 
 	memset(info, 0, sizeof *info);
 	info->control = intf;
-	while (len > 3) {
+
+	/* == 20180119 AVM/WKR cdc parse security ported from cdc_ncm driver ==*/
+	while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
+
 		if (buf [1] != USB_DT_CS_INTERFACE)
 			goto next_desc;
 
@@ -165,7 +168,12 @@
 						"ACM capabilities %02x, "
 						"not really RNDIS?\n",
 						acm->bmCapabilities);
+
+/* 20150325 AVM/WK: Fix from 2.6.32 for buggy ZTE rndis modems, ignore buggy descriptor */
+#if 0
 					goto bad_desc;
+#endif
+
 				}
 			}
 			break;