diff --git a/route/address.go b/route/address.go
index 5443d67223..f42d723b36 100644
--- a/route/address.go
+++ b/route/address.go
@@ -172,18 +172,31 @@ func (a *Inet6Addr) marshal(b []byte) (int, error) {
 func parseInetAddr(af int, b []byte) (Addr, error) {
 	switch af {
 	case syscall.AF_INET:
-		if len(b) < sizeofSockaddrInet {
+		l := int(b[0])
+		if len(b) < l || l < 4 {
 			return nil, errInvalidAddr
 		}
 		a := &Inet4Addr{}
-		copy(a.IP[:], b[4:8])
+		n := 8
+		if l < 8 {
+			n = l
+		}
+		copy(a.IP[:], b[4:n])
 		return a, nil
 	case syscall.AF_INET6:
-		if len(b) < sizeofSockaddrInet6 {
+		l := int(b[0])
+		if len(b) < l || l < 8 {
 			return nil, errInvalidAddr
 		}
-		a := &Inet6Addr{ZoneID: int(nativeEndian.Uint32(b[24:28]))}
-		copy(a.IP[:], b[8:24])
+		n := 24
+		if l < 24 {
+			n = l
+		}
+		a := &Inet6Addr{}
+		if n >= 28 {
+			a.ZoneID = int(nativeEndian.Uint32(b[24:28]))
+		}
+		copy(a.IP[:], b[8:n])
 		if a.IP[0] == 0xfe && a.IP[1]&0xc0 == 0x80 || a.IP[0] == 0xff && (a.IP[1]&0x0f == 0x01 || a.IP[1]&0x0f == 0x02) {
 			// KAME based IPv6 protocol stack usually
 			// embeds the interface index in the