l2tp: prevent creation of sessions on terminated tunnels

commit f3c66d4e144a0904ea9b95d23ed9f8eb38c11bfb upstream.

l2tp_tunnel_destruct() sets tunnel->sock to NULL, then removes the
tunnel from the pernet list and finally closes all its sessions.
Therefore, it's possible to add a session to a tunnel that is still
reachable, but for which tunnel->sock has already been reset. This can
make l2tp_session_create() dereference a NULL pointer when calling
sock_hold(tunnel->sock).

This patch adds the .acpt_newsess field to struct l2tp_tunnel, which is
used by l2tp_tunnel_closeall() to prevent addition of new sessions to
tunnels. Resetting tunnel->sock is done after l2tp_tunnel_closeall()
returned, so that l2tp_session_add_to_tunnel() can safely take a
reference on it when .acpt_newsess is true.

The .acpt_newsess field is modified in l2tp_tunnel_closeall(), rather
than in l2tp_tunnel_destruct(), so that it benefits all tunnel removal
mechanisms. E.g. on UDP tunnels, a session could be added to a tunnel
after l2tp_udp_encap_destroy() proceeded. This would prevent the tunnel
from being removed because of the references held by this new session
on the tunnel and its socket. Even though the session could be removed
manually later on, this defeats the purpose of
commit 9980d001cec8 ("l2tp: add udp encap socket destroy handler").

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2:
 - Drop changes in l2tp_tunnel_destruct(), as the assignment to tunnel->sock
   is already after the call to l2tp_tunnel_closeall()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index b539c78..5fa9068 100644 (file)
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -335,13 +335,21 @@ static int l2tp_session_add_to_tunnel(struct l2tp_tunnel *tunnel,
        struct hlist_head *head;
        struct l2tp_net *pn;
        struct hlist_node *walk;
+       int err;
 
        head = l2tp_session_id_hash(tunnel, session->session_id);
 
        write_lock_bh(&tunnel->hlist_lock);
+       if (!tunnel->acpt_newsess) {
+               err = -ENODEV;
+               goto err_tlock;
+       }
+
        hlist_for_each_entry(session_walk, walk, head, hlist)
-               if (session_walk->session_id == session->session_id)
-                       goto exist;
+               if (session_walk->session_id == session->session_id) {
+                       err = -EEXIST;
+                       goto err_tlock;
+               }
 
        if (tunnel->version == L2TP_HDR_VER_3) {
                pn = l2tp_pernet(tunnel->l2tp_net);
@@ -349,12 +357,21 @@ static int l2tp_session_add_to_tunnel(struct l2tp_tunnel *tunnel,
                                                session->session_id);
 
                spin_lock_bh(&pn->l2tp_session_hlist_lock);
+
                hlist_for_each_entry(session_walk, walk, g_head, global_hlist)
-                       if (session_walk->session_id == session->session_id)
-                               goto exist_glob;
+                       if (session_walk->session_id == session->session_id) {
+                               err = -EEXIST;
+                               goto err_tlock_pnlock;
+                       }
 
+               l2tp_tunnel_inc_refcount(tunnel);
+               sock_hold(tunnel->sock);
                hlist_add_head_rcu(&session->global_hlist, g_head);
+
                spin_unlock_bh(&pn->l2tp_session_hlist_lock);
+       } else {
+               l2tp_tunnel_inc_refcount(tunnel);
+               sock_hold(tunnel->sock);
        }
 
        hlist_add_head(&session->hlist, head);
@@ -362,12 +379,12 @@ static int l2tp_session_add_to_tunnel(struct l2tp_tunnel *tunnel,
 
        return 0;
 
-exist_glob:
+err_tlock_pnlock:
        spin_unlock_bh(&pn->l2tp_session_hlist_lock);
-exist:
+err_tlock:
        write_unlock_bh(&tunnel->hlist_lock);
 
-       return -EEXIST;
+       return err;
 }
 
 /* Lookup a tunnel by id
@@ -1282,6 +1299,7 @@ static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel)
               "%s: closing all sessions...\n", tunnel->name);
 
        write_lock_bh(&tunnel->hlist_lock);
+       tunnel->acpt_newsess = false;
        for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
 again:
                hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
@@ -1504,6 +1522,7 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
        tunnel->magic = L2TP_TUNNEL_MAGIC;
        sprintf(&tunnel->name[0], "tunl %u", tunnel_id);
        rwlock_init(&tunnel->hlist_lock);
+       tunnel->acpt_newsess = true;
 
        /* The net we belong to */
        tunnel->l2tp_net = net;
@@ -1719,11 +1738,6 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
                        return ERR_PTR(err);
                }
 
-               l2tp_tunnel_inc_refcount(tunnel);
-
-               /* Ensure tunnel socket isn't deleted */
-               sock_hold(tunnel->sock);
-
                /* Ignore management session in session count value */
                if (session->session_id != 0)
                        atomic_inc(&l2tp_session_count);

diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 2066d23..1bc5859 100644 (file)
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -159,6 +159,10 @@ struct l2tp_tunnel {
        int                     magic;          /* Should be L2TP_TUNNEL_MAGIC */
        struct rcu_head rcu;
        rwlock_t                hlist_lock;     /* protect session_hlist */
+       bool                    acpt_newsess;   /* Indicates whether this
+                                                * tunnel accepts new sessions.
+                                                * Protected by hlist_lock.
+                                                */
        struct hlist_head       session_hlist[L2TP_HASH_SIZE];
                                                /* hashed list of sessions,
                                                 * hashed by id */