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Diffstat (limited to 'net/l2tp/l2tp_ppp.c')
-rw-r--r--net/l2tp/l2tp_ppp.c60
1 files changed, 26 insertions, 34 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 59f246d7b290..3b02f24ea9ec 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -416,20 +416,28 @@ abort:
* Session (and tunnel control) socket create/destroy.
*****************************************************************************/
+static void pppol2tp_put_sk(struct rcu_head *head)
+{
+ struct pppol2tp_session *ps;
+
+ ps = container_of(head, typeof(*ps), rcu);
+ sock_put(ps->__sk);
+}
+
/* Called by l2tp_core when a session socket is being closed.
*/
static void pppol2tp_session_close(struct l2tp_session *session)
{
- struct sock *sk;
-
- BUG_ON(session->magic != L2TP_SESSION_MAGIC);
+ struct pppol2tp_session *ps;
- sk = pppol2tp_session_get_sock(session);
- if (sk) {
- if (sk->sk_socket)
- inet_shutdown(sk->sk_socket, SEND_SHUTDOWN);
- sock_put(sk);
- }
+ ps = l2tp_session_priv(session);
+ mutex_lock(&ps->sk_lock);
+ ps->__sk = rcu_dereference_protected(ps->sk,
+ lockdep_is_held(&ps->sk_lock));
+ RCU_INIT_POINTER(ps->sk, NULL);
+ if (ps->__sk)
+ call_rcu(&ps->rcu, pppol2tp_put_sk);
+ mutex_unlock(&ps->sk_lock);
}
/* Really kill the session socket. (Called from sock_put() if
@@ -449,14 +457,6 @@ static void pppol2tp_session_destruct(struct sock *sk)
}
}
-static void pppol2tp_put_sk(struct rcu_head *head)
-{
- struct pppol2tp_session *ps;
-
- ps = container_of(head, typeof(*ps), rcu);
- sock_put(ps->__sk);
-}
-
/* Called when the PPPoX socket (session) is closed.
*/
static int pppol2tp_release(struct socket *sock)
@@ -480,26 +480,17 @@ static int pppol2tp_release(struct socket *sock)
sock_orphan(sk);
sock->sk = NULL;
+ /* If the socket is associated with a session,
+ * l2tp_session_delete will call pppol2tp_session_close which
+ * will drop the session's ref on the socket.
+ */
session = pppol2tp_sock_to_session(sk);
-
- if (session != NULL) {
- struct pppol2tp_session *ps;
-
+ if (session) {
l2tp_session_delete(session);
-
- ps = l2tp_session_priv(session);
- mutex_lock(&ps->sk_lock);
- ps->__sk = rcu_dereference_protected(ps->sk,
- lockdep_is_held(&ps->sk_lock));
- RCU_INIT_POINTER(ps->sk, NULL);
- mutex_unlock(&ps->sk_lock);
- call_rcu(&ps->rcu, pppol2tp_put_sk);
-
- /* Rely on the sock_put() call at the end of the function for
- * dropping the reference held by pppol2tp_sock_to_session().
- * The last reference will be dropped by pppol2tp_put_sk().
- */
+ /* drop the ref obtained by pppol2tp_sock_to_session */
+ sock_put(sk);
}
+
release_sock(sk);
/* This will delete the session context via
@@ -796,6 +787,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
out_no_ppp:
/* This is how we get the session context from the socket. */
+ sock_hold(sk);
sk->sk_user_data = session;
rcu_assign_pointer(ps->sk, sk);
mutex_unlock(&ps->sk_lock);