[IrDA]: af_irda.c cleanups

We lock the socket when both releasing and getting a disconnected
notification. In the latter case, we also ste the socket as orphan.
This fixes a potential kernel bug that can be triggered when we get the
disconnection notification before closing the socket.

Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c
index 17699ee..7b7cd5b 100644 (file)
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -132,13 +132,14 @@ static void irda_disconnect_indication(void *instance, void *sap,
 
        /* Prevent race conditions with irda_release() and irda_shutdown() */
        if (!sock_flag(sk, SOCK_DEAD) && sk->sk_state != TCP_CLOSE) {
+               lock_sock(sk);
                sk->sk_state     = TCP_CLOSE;
                sk->sk_err       = ECONNRESET;
                sk->sk_shutdown |= SEND_SHUTDOWN;
 
                sk->sk_state_change(sk);
-               /* Uh-oh... Should use sock_orphan ? */
-                sock_set_flag(sk, SOCK_DEAD);
+                sock_orphan(sk);
+               release_sock(sk);
 
                /* Close our TSAP.
                 * If we leave it open, IrLMP put it back into the list of
@@ -1212,6 +1213,7 @@ static int irda_release(struct socket *sock)
         if (sk == NULL)
                return 0;
 
+       lock_sock(sk);
        sk->sk_state       = TCP_CLOSE;
        sk->sk_shutdown   |= SEND_SHUTDOWN;
        sk->sk_state_change(sk);
@@ -1221,6 +1223,7 @@ static int irda_release(struct socket *sock)
 
        sock_orphan(sk);
        sock->sk   = NULL;
+       release_sock(sk);
 
        /* Purge queues (see sock_init_data()) */
        skb_queue_purge(&sk->sk_receive_queue);
@@ -1353,6 +1356,7 @@ static int irda_recvmsg_dgram(struct kiocb *iocb, struct socket *sock,
        IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 
        IRDA_ASSERT(self != NULL, return -1;);
+       IRDA_ASSERT(!sock_error(sk), return -1;);
 
        skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
                                flags & MSG_DONTWAIT, &err);
@@ -1405,6 +1409,7 @@ static int irda_recvmsg_stream(struct kiocb *iocb, struct socket *sock,
        IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
 
        IRDA_ASSERT(self != NULL, return -1;);
+       IRDA_ASSERT(!sock_error(sk), return -1;);
 
        if (sock->flags & __SO_ACCEPTCON)
                return(-EINVAL);