[IPV6]: ROUTE: Set appropriate information before inserting a route.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 15 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e8855706980..5b58a516bb1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1221,21 +1221,24 @@ void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
            2. It is gatewayed route or NONEXTHOP route. Action: clone it.
          */
         if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
-                nrt = rt6_cow(rt, daddr, saddr, NULL);
-                if (!nrt->u.dst.error) {
-                        nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
-                        if (allfrag)
-                                nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
-                        /* According to RFC 1981, detecting PMTU increase shouldn't be
-                           happened within 5 mins, the recommended timer is 10 mins.
-                           Here this route expiration time is set to ip6_rt_mtu_expires
-                           which is 10 mins. After 10 mins the decreased pmtu is expired
-                           and detecting PMTU increase will be automatically happened.
-                         */
-                        dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
-                        nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
-                }
-                dst_release(&nrt->u.dst);
+                nrt = rt6_alloc_cow(rt, daddr, saddr);
+                if (!nrt)
+                        goto out;
+
+                nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
+                if (allfrag)
+                        nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
+
+                /* According to RFC 1981, detecting PMTU increase shouldn't be
+                 * happened within 5 mins, the recommended timer is 10 mins.
+                 * Here this route expiration time is set to ip6_rt_mtu_expires
+                 * which is 10 mins. After 10 mins the decreased pmtu is expired
+                 * and detecting PMTU increase will be automatically happened.
+                 */
+                dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
+                nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
+
+                ip6_ins_rt(nrt, NULL, NULL, NULL);
         } else {
                 nrt = ip6_rt_copy(rt);
                 if (nrt == NULL)