1 files changed, 9 insertions, 0 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ed01f9a330d6..0e0d6ce69021 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -952,6 +952,15 @@ static void ndisc_recv_na(struct sk_buff *skb)
                 if (neigh->nud_state & NUD_FAILED)
                         goto out;
 
+                /*
+                 * Don't update the neighbor cache entry on a proxy NA from
+                 * ourselves because either the proxied node is off link or it
+                 * has already sent a NA to us.
+                 */
+                if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
+                    pneigh_lookup(&nd_tbl, &msg->target, dev, 0))
+                        goto out;
+
                 neigh_update(neigh, lladdr,
                              msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
                              NEIGH_UPDATE_F_WEAK_OVERRIDE|