IrDA: Correctly handling socket error

From: Olaf Kirch <[email protected]>

This patch fixes an oops first reported in mid 2006 - see
http://lkml.org/lkml/2006/8/29/358 The cause of this bug report is that when an error is signalled on the socket, irda_recvmsg_stream returns without removing a local wait_queue variable from the socket's sk_sleep queue. This causes havoc further down the road.

In response to this problem, a patch was made that invoked sock_orphan on the socket when receiving a disconnect indication. This is not a good fix, as this sets sk_sleep to NULL, causing applications sleeping in recvmsg (and other places) to oops.

This is against the latest net-2.6 and should be considered for -stable inclusion.

---
 net/irda/af_irda.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

index f9b15d4..bf994c8 100644
@@ -138,7 +138,6 @@ static void irda_disconnect_indication(void *instance, void *sap,
 		sk->sk_shutdown |= SEND_SHUTDOWN;
 
 		sk->sk_state_change(sk);
-		sock_orphan(sk);
 		release_sock(sk);
 
 		/* Close our TSAP.

@@ -1445,7 +1444,7 @@ static int irda_recvmsg_stream(struct kiocb *iocb, struct socket *sock,
 			 */
 			ret = sock_error(sk);
 			if (ret)
-				break;
+				;
 			else if (sk->sk_shutdown & RCV_SHUTDOWN)
 				;
 			else if (noblock)

1.5.1



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From: Samuel Ortiz <[email protected]>
Date: Thu, 19 Apr 2007 00:45:26 +0300

Applied and I'll push this to -stable too, thanks!