x25: Fix sleep from timer on socket destroy.

If socket destuction gets delayed to a timer, we try to
lock_sock() from that timer which won't work.

Use bh_lock_sock() in that case.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 19 insertions, 6 deletions

diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index ed80af8..c51f309 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -332,14 +332,14 @@ static unsigned int x25_new_lci(struct x25_neigh *nb)
 /*
  *	Deferred destroy.
  */
-void x25_destroy_socket(struct sock *);
+static void __x25_destroy_socket(struct sock *);
 
 /*
  *	handler for deferred kills.
  */
 static void x25_destroy_timer(unsigned long data)
 {
-	x25_destroy_socket((struct sock *)data);
+	x25_destroy_socket_from_timer((struct sock *)data);
 }
 
 /*
@@ -349,12 +349,10 @@ static void x25_destroy_timer(unsigned long data)
  *	will touch it and we are (fairly 8-) ) safe.
  *	Not static as it's used by the timer
  */
-void x25_destroy_socket(struct sock *sk)
+static void __x25_destroy_socket(struct sock *sk)
 {
 	struct sk_buff *skb;
 
-	sock_hold(sk);
-	lock_sock(sk);
 	x25_stop_heartbeat(sk);
 	x25_stop_timer(sk);
 
@@ -385,7 +383,22 @@ void x25_destroy_socket(struct sock *sk)
 		/* drop last reference so sock_put will free */
 		__sock_put(sk);
 	}
+}
 
+void x25_destroy_socket_from_timer(struct sock *sk)
+{
+	sock_hold(sk);
+	bh_lock_sock(sk);
+	__x25_destroy_socket(sk);
+	bh_unlock_sock(sk);
+	sock_put(sk);
+}
+
+static void x25_destroy_socket(struct sock *sk)
+{
+	sock_hold(sk);
+	lock_sock(sk);
+	__x25_destroy_socket(sk);
 	release_sock(sk);
 	sock_put(sk);
 }
diff --git a/net/x25/x25_timer.c b/net/x25/x25_timer.c
index d3e3e54..5c5db1a 100644
--- a/net/x25/x25_timer.c
+++ b/net/x25/x25_timer.c
@@ -113,7 +113,7 @@ static void x25_heartbeat_expiry(unsigned long param)
 			    (sk->sk_state == TCP_LISTEN &&
 			     sock_flag(sk, SOCK_DEAD))) {
 				bh_unlock_sock(sk);
-				x25_destroy_socket(sk);
+				x25_destroy_socket_from_timer(sk);
 				return;
 			}
 			break;