diff --git a/dhcp-4.0.0-discover-file-handle.patch b/dhcp-4.0.0-discover-file-handle.patch
deleted file mode 100644
index 33eae93..0000000
--- a/dhcp-4.0.0-discover-file-handle.patch
+++ /dev/null
@@ -1,29 +0,0 @@
-diff -up dhcp-4.0.0/common/discover.c.fp dhcp-4.0.0/common/discover.c
---- dhcp-4.0.0/common/discover.c.fp	2008-01-15 10:25:45.000000000 -1000
-+++ dhcp-4.0.0/common/discover.c	2008-01-15 10:27:08.000000000 -1000
-@@ -461,6 +461,12 @@ next_iface4(struct iface_info *info, int
- 	char *name;
- 	struct ifreq tmp;
- 
-+	if (!ifaces->fp) {
-+		log_error("Error reading interface information");
-+		*err = 1;
-+		return 0;
-+	}
-+
- 	/*
- 	 * Loop exits when we find an interface that has an address, or 
- 	 * when we run out of interfaces.
-@@ -587,6 +593,12 @@ next_iface6(struct iface_info *info, int
- 	struct sockaddr_in6 addr;
- 	struct ifreq tmp;
- 
-+	if (!ifaces->fp6) {
-+		log_error("Error reading interface information");
-+		*err = 1;
-+		return 0;
-+	}
-+
- 	do {
- 		/*
- 		 *  Read the next line in the file.
diff --git a/dhcp-4.0.0-parser.patch b/dhcp-4.0.0-parser.patch
new file mode 100644
index 0000000..b38c895
--- /dev/null
+++ b/dhcp-4.0.0-parser.patch
@@ -0,0 +1,18 @@
+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) {
diff --git a/dhcp.spec b/dhcp.spec
index d69cbf5..64837b2 100644
--- a/dhcp.spec
+++ b/dhcp.spec
@@ -4,7 +4,7 @@
 Summary:  DHCP (Dynamic Host Configuration Protocol) server and relay agent
 Name:     dhcp
 Version:  4.0.0
-Release:  3%{?dist}
+Release:  4%{?dist}
 # NEVER CHANGE THE EPOCH on this package.  The previous maintainer made
 # incorrect use of the epoch and that's why it is at 12 now.  It should have
 # never been used, but it was.  So we are stuck with it.
@@ -42,7 +42,7 @@ Patch13:  %{name}-4.0.0-dhclient-anycast.patch
 Patch14:  %{name}-4.0.0-manpages.patch
 Patch15:  %{name}-4.0.0-paths.patch
 Patch16:  %{name}-4.0.0-libdhcp4client.patch
-Patch17:  %{name}-4.0.0-discover-file-handle.patch
+Patch17:  %{name}-4.0.0-parser.patch
 
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: autoconf
@@ -189,7 +189,7 @@ client library.
 # Add the libdhcp4client target (library version of dhclient)
 %patch16 -p1
 
-# Check file handle passed to fgets() in common/discover.c
+# Fix parsing errors
 %patch17 -p1
 
 # Copy in documentation and example scripts for LDAP patch to dhcpd
@@ -235,7 +235,7 @@ automake --foreign --add-missing --copy
 %build
 CFLAGS="%{optflags} -fPIC" \
 %configure \
-    --enable-dhcpv6 \
+    --disable-dhcpv6 \
     --with-srv-lease-file=%{_localstatedir}/lib/dhcpd/dhcpd.leases \
     --with-cli-lease-file=%{_localstatedir}/lib/dhclient/dhclient.leases \
     --with-srv-pid-file=%{_localstatedir}/run/dhcpd.pid \
@@ -404,6 +404,10 @@ fi
 %{_libdir}/libdhcp4client.so
 
 %changelog
+* Wed Jan 16 2008 David Cantrell <dcantrell@redhat.com> - 12:4.0.0-4
+- Fix dhclient.lease file parsing problems (#428785)
+- Disable IPv6 support for now as we already ship dhcpv6 (#428987)
+
 * Tue Jan 15 2008 David Cantrell <dcantrell@redhat.com> - 12:4.0.0-3
 - Fix segfault in next_iface4() and next_iface6() (#428870)