Index: rules.c
===================================================================
RCS file: /home/cvs/cvsroot/Owl/packages/john/john/src/rules.c,v
retrieving revision 1.30
diff -u -r1.30 rules.c
--- rules.c	31 May 2016 07:11:51 -0000	1.30
+++ rules.c	8 Jul 2016 13:16:19 -0000
@@ -1,6 +1,6 @@
 /*
  * This file is part of John the Ripper password cracker,
- * Copyright (c) 1996-99,2003,2005,2009,2010,2015 by Solar Designer
+ * Copyright (c) 1996-99,2003,2005,2009,2010,2015,2016 by Solar Designer
  */
 
 #include <stdio.h>
@@ -349,7 +349,7 @@
 		in = buffer[2];
 
 	length = 0;
-	while (length < RULE_WORD_SIZE - 1) {
+	while (length < RULE_WORD_SIZE) {
 		if (!(in[length] = word[length]))
 			break;
 		length++;
@@ -378,7 +378,8 @@
 	which = 0;
 
 	while (RULE) {
-		in[RULE_WORD_SIZE - 1] = 0;
+		if (length >= RULE_WORD_SIZE)
+			in[length = RULE_WORD_SIZE - 1] = 0;
 
 		switch (LAST) {
 /* Crack 4.1 rules */