3 files changed, 12 insertions, 2 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 514627f56339..10422ef14e28 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -160,7 +160,8 @@ struct fib_table {
         struct hlist_node tb_hlist;
         u32             tb_id;
         int             tb_default;
-        unsigned char   tb_data[0];
+        int             tb_num_default;
+        unsigned long   tb_data[0];
 };
 
 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index bde80c450b52..9ac481a10d37 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1332,6 +1332,9 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
                 }
         }
 
+        if (!plen)
+                tb->tb_num_default++;
+
         list_add_tail_rcu(&new_fa->fa_list,
                           (fa ? &fa->fa_list : fa_head));
 
@@ -1697,6 +1700,9 @@ int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
 
         list_del_rcu(&fa->fa_list);
 
+        if (!plen)
+                tb->tb_num_default--;
+
         if (list_empty(fa_head)) {
                 hlist_del_rcu(&li->hlist);
                 free_leaf_info(li);
@@ -1987,6 +1993,7 @@ struct fib_table *fib_trie_table(u32 id)
 
         tb->tb_id = id;
         tb->tb_default = -1;
+        tb->tb_num_default = 0;
 
         t = (struct trie *) tb->tb_data;
         memset(t, 0, sizeof(*t));
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 0e7430c327a7..e9aee81de3e3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2615,7 +2615,9 @@ static struct rtable *ip_route_output_slow(struct net *net,
                 fib_select_multipath(&res);
         else
 #endif
-        if (!res.prefixlen && res.type == RTN_UNICAST && !fl4.flowi4_oif)
+        if (!res.prefixlen &&
+            res.table->tb_num_default > 1 &&
+            res.type == RTN_UNICAST && !fl4.flowi4_oif)
                 fib_select_default(&res);
 
         if (!fl4.saddr)