--- vmstat.c	2015-02-25 12:47:55.654651030 +0800
+++ vmstat.c	2015-05-03 23:32:40.725299000 +0800
@@ -1252,7 +1252,8 @@ 
 	/* Determine the length of the longest interrupt name */
 	intrname = intrnames;
 	istrnamlen = strlen("interrupt");
-	while(*intrname != '\0') {
+	while((*intrname != '\0') && 
+		(inamlen > (intrname-intrnames))) {
 		clen = strlen(intrname);
 		if (clen > istrnamlen)
 			istrnamlen = clen;