linux-kernel - [ 096/108] Fix pppol2tp getsockname()

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Date:	Fri, 30 Mar 2012 12:58:58 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Benjamin LaHaise <bcrl@...ck.org>,
	James Chapman <jchapman@...alix.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 096/108] Fix pppol2tp getsockname()

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Benjamin LaHaise <bcrl@...ck.org>

[ Upstream commit bbdb32cb5b73597386913d052165423b9d736145 ]

While testing L2TP functionality, I came across a bug in getsockname().  The
IP address returned within the pppol2tp_addr's addr memember was not being
set to the IP  address in use.  This bug is caused by using inet_sk() on the
wrong socket (the L2TP socket rather than the underlying UDP socket), and was
likely introduced during the addition of L2TPv3 support.

Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
Signed-off-by: James Chapman <jchapman@...alix.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/l2tp/l2tp_ppp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -908,7 +908,7 @@ static int pppol2tp_getname(struct socke
 		goto end_put_sess;
 	}
 
-	inet = inet_sk(sk);
+	inet = inet_sk(tunnel->sock);
 	if (tunnel->version == 2) {
 		struct sockaddr_pppol2tp sp;
 		len = sizeof(sp);


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