diff -up dhcp-4.0.0/common/conflex.c.parse dhcp-4.0.0/common/conflex.c

--- dhcp-4.0.0/common/conflex.c.parse	2008-01-16 15:26:09.000000000 -1000

+++ dhcp-4.0.0/common/conflex.c	2008-01-16 16:02:48.000000000 -1000

@@ -182,8 +182,12 @@ static int get_char (cfile)

 			c = EOF;

 		}

 	} else {

-		c = cfile->inbuf [cfile->bufix];

-		cfile->bufix++;

+		if (strlen(cfile->inbuf) >= (cfile->bufix + 1)) {

+			c = EOF;

+		} else {

+			c = cfile->inbuf [cfile->bufix];

+			cfile->bufix++;

+		}

 	}

 	if (!cfile->ugflag) {