---

yaml
---
r: 88043
b: refs/heads/master
c: eac55bf
h: refs/heads/master
i:
  88041: b8a071d
  88039: a68fc52
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c6fbfac2e61c9a8617f64b93e8c990b8d864bce5
+refs/heads/master: eac55bf97094f6b64116426864cf4666ef7587bc

trunk/net/ipv6/addrconf.c

@@ -776,6 +776,7 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *i
 	struct inet6_dev *idev = ifp->idev;
 	struct in6_addr addr, *tmpaddr;
 	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
+	unsigned long regen_advance;
 	int tmp_plen;
 	int ret = 0;
 	int max_addresses;
@@ -836,8 +837,23 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *i
 	tmp_tstamp = ifp->tstamp;
 	spin_unlock_bh(&ifp->lock);
 
+	regen_advance = idev->cnf.regen_max_retry *
+	                idev->cnf.dad_transmits *
+	                idev->nd_parms->retrans_time / HZ;
 	write_unlock(&idev->lock);
 
+	/* A temporary address is created only if this calculated Preferred
+	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
+	 * an implementation must not create a temporary address with a zero
+	 * Preferred Lifetime.
+	 */
+	if (tmp_prefered_lft <= regen_advance) {
+		in6_ifa_put(ifp);
+		in6_dev_put(idev);
+		ret = -1;
+		goto out;
+	}
+
 	addr_flags = IFA_F_TEMPORARY;
 	/* set in addrconf_prefix_rcv() */
 	if (ifp->flags & IFA_F_OPTIMISTIC)