netdev - [PATCH] [net-2.6] IrDA: Correctly handling socket error

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Message-ID: <20070418214526.GA4496@sortiz.org>
Date:	Thu, 19 Apr 2007 00:45:26 +0300
From:	Samuel Ortiz <samuel@...tiz.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, irda-users@...ts.sourceforge.net,
	Olaf Kirch <olaf.kirch@...cle.com>, stable@...nel.org
Subject: [PATCH] [net-2.6] IrDA: Correctly handling socket error

From: Olaf Kirch <olaf.kirch@...cle.com>

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. 

Signed-off-by: Olaf Kirch <olaf.kirch@...cle.com>
Signed-off-by: Samuel Ortiz <samuel@...tiz.org>
---
 net/irda/af_irda.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c
index f9b15d4..bf994c8 100644
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -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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