ipam: return error for invalid ip range (#3088)

Author: zhangzujian

pkg/ipam/ip_range_list.go

@@ -43,6 +43,9 @@ func NewIPRangeListFrom(x ...string) (*IPRangeList, error) {
 			if err != nil {
 				return nil, err
 			}
+			if start.GreaterThan(end) {
+				return nil, fmt.Errorf("invalid ip range %q: %s is greater than %s", s, start, end)
+			}
 			r = NewIPRange(start, end)
 		} else if strings.ContainsRune(s, '/') {
 			_, cidr, err := net.ParseCIDR(s)

test/e2e/framework/util.go

@@ -199,7 +199,7 @@ func randomPool(cidr string, count int) []string {
 			x, y := k%len(ips), (k+1)%len(ips)
 			n1, _ := rl.Find(ips[x])
 			n2, _ := rl.Find(ips[y])
-			if n1 == n2 {
+			if n1 == n2 && ips[x].LessThan(ips[y]) {
 				set.Add(fmt.Sprintf("%s..%s", ips[x].String(), ips[y].String()))
 				i, k = i+1, k+2
 				continue