tcp: fix a timewait refcnt race

After TCP RCU conversion, tw->tw_refcnt should not be set to 1 in
inet_twsk_alloc(). It allows a RCU reader to get this timewait socket,
while we not yet stabilized it.

Only choice we have is to set tw_refcnt to 0 in inet_twsk_alloc(),
then atomic_add() it later, once everything is done.

Location of this atomic_add() is tricky, because we dont want another
writer to find this timewait in ehash, while tw_refcnt is still zero !

Thanks to Kapil Dakhane tests and reports.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 3 deletions

diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 11a107a5af4f..0fdf45e4c90c 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -109,7 +109,6 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
         tw->tw_tb = icsk->icsk_bind_hash;
         WARN_ON(!icsk->icsk_bind_hash);
         inet_twsk_add_bind_node(tw, &tw->tw_tb->owners);
-        atomic_inc(&tw->tw_refcnt);
         spin_unlock(&bhead->lock);
 
         spin_lock(lock);
@@ -119,13 +118,22 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
          * Should be done before removing sk from established chain
          * because readers are lockless and search established first.
          */
-        atomic_inc(&tw->tw_refcnt);
         inet_twsk_add_node_rcu(tw, &ehead->twchain);
 
         /* Step 3: Remove SK from established hash. */
         if (__sk_nulls_del_node_init_rcu(sk))
                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 
+        /*
+         * Notes :
+         * - We initially set tw_refcnt to 0 in inet_twsk_alloc()
+         * - We add one reference for the bhash link
+         * - We add one reference for the ehash link
+         * - We want this refcnt update done before allowing other
+         *   threads to find this tw in ehash chain.
+         */
+        atomic_add(1 + 1 + 1, &tw->tw_refcnt);
+
         spin_unlock(lock);
 }
 
@@ -157,7 +165,12 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int stat
                 tw->tw_transparent  = inet->transparent;
                 tw->tw_prot         = sk->sk_prot_creator;
                 twsk_net_set(tw, hold_net(sock_net(sk)));
-                atomic_set(&tw->tw_refcnt, 1);
+                /*
+                 * Because we use RCU lookups, we should not set tw_refcnt
+                 * to a non null value before everything is setup for this
+                 * timewait socket.
+                 */
+                atomic_set(&tw->tw_refcnt, 0);
                 inet_twsk_dead_node_init(tw);
                 __module_get(tw->tw_prot->owner);
         }