Index: ppp-2.4.6/pppd/chap_ms.c
===================================================================
--- ppp-2.4.6.orig/pppd/chap_ms.c	2014-07-29 00:38:03.073968867 +0100
+++ ppp-2.4.6/pppd/chap_ms.c	2014-07-29 00:41:52.897964689 +0100
@@ -382,7 +382,7 @@
 		      unsigned char *private)
 {
 	const struct chapms2_response_cache_entry *cache_entry;
-	unsigned char auth_response[MS_AUTH_RESPONSE_LENGTH];
+	unsigned char auth_response[MS_AUTH_RESPONSE_LENGTH+1];
 
 	challenge++;	/* skip length, should be 16 */
 	*response++ = MS_CHAP2_RESPONSE_LEN;