neigh: do not modify unlinked entries

The lockless lookups can return entry that is unlinked.
Sometimes they get reference before last neigh_cleanup_and_release,
sometimes they do not need reference. Later, any
modification attempts may result in the following problems:

1. entry is not destroyed immediately because neigh_update
can start the timer for dead entry, eg. on change to NUD_REACHABLE
state. As result, entry lives for some time but is invisible
and out of control.

2. __neigh_event_send can run in parallel with neigh_destroy
while refcnt=0 but if timer is started and expired refcnt can
reach 0 for second time leading to second neigh_destroy and
possible crash.

Thanks to Eric Dumazet and Ying Xue for their work and analyze
on the __neigh_event_send change.

Fixes: 767e97e1e0db ("neigh: RCU conversion of struct neighbour")
Fixes: a263b3093641 ("ipv4: Make neigh lookups directly in output packet path.")
Fixes: 6fd6ce2056de ("ipv6: Do not depend on rt->n in ip6_finish_output2().")
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 3de654256028..2237c1b3cdd2 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -957,6 +957,8 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
         rc = 0;
         if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE))
                 goto out_unlock_bh;
+        if (neigh->dead)
+                goto out_dead;
 
         if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) {
                 if (NEIGH_VAR(neigh->parms, MCAST_PROBES) +
@@ -1013,6 +1015,13 @@ out_unlock_bh:
                 write_unlock(&neigh->lock);
         local_bh_enable();
         return rc;
+
+out_dead:
+        if (neigh->nud_state & NUD_STALE)
+                goto out_unlock_bh;
+        write_unlock_bh(&neigh->lock);
+        kfree_skb(skb);
+        return 1;
 }
 EXPORT_SYMBOL(__neigh_event_send);
 
@@ -1076,6 +1085,8 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
         if (!(flags & NEIGH_UPDATE_F_ADMIN) &&
             (old & (NUD_NOARP | NUD_PERMANENT)))
                 goto out;
+        if (neigh->dead)
+                goto out;
 
         if (!(new & NUD_VALID)) {
                 neigh_del_timer(neigh);
@@ -1225,6 +1236,8 @@ EXPORT_SYMBOL(neigh_update);
  */
 void __neigh_set_probe_once(struct neighbour *neigh)
 {
+        if (neigh->dead)
+                return;
         neigh->updated = jiffies;
         if (!(neigh->nud_state & NUD_FAILED))
                 return;