linux-kernel - [PATCH 3.2 47/94] net/l2tp: don't fall back on UDP [get|set]sockopt

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Date:	Mon, 04 Aug 2014 17:48:32 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Sasha Levin" <sasha.levin@...cle.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Phil Turnbull" <phil.turnbull@...cle.com>,
	"Willy Tarreau" <w@....eu>, "David Miller" <davem@...emloft.net>,
	"James Chapman" <jchapman@...alix.com>,
	"Vegard Nossum" <vegard.nossum@...cle.com>
Subject: [PATCH 3.2 47/94] net/l2tp: don't fall back on UDP [get|set]sockopt

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Sasha Levin <sasha.levin@...cle.com>

commit 3cf521f7dc87c031617fd47e4b7aa2593c2f3daf upstream.

The l2tp [get|set]sockopt() code has fallen back to the UDP functions
for socket option levels != SOL_PPPOL2TP since day one, but that has
never actually worked, since the l2tp socket isn't an inet socket.

As David Miller points out:

  "If we wanted this to work, it'd have to look up the tunnel and then
   use tunnel->sk, but I wonder how useful that would be"

Since this can never have worked so nobody could possibly have depended
on that functionality, just remove the broken code and return -EINVAL.

Reported-by: Sasha Levin <sasha.levin@...cle.com>
Acked-by: James Chapman <jchapman@...alix.com>
Acked-by: David Miller <davem@...emloft.net>
Cc: Phil Turnbull <phil.turnbull@...cle.com>
Cc: Vegard Nossum <vegard.nossum@...cle.com>
Cc: Willy Tarreau <w@....eu>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/l2tp/l2tp_ppp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -1351,7 +1351,7 @@ static int pppol2tp_setsockopt(struct so
 	int err;
 
 	if (level != SOL_PPPOL2TP)
-		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
+		return -EINVAL;
 
 	if (optlen < sizeof(int))
 		return -EINVAL;
@@ -1477,7 +1477,7 @@ static int pppol2tp_getsockopt(struct so
 	struct pppol2tp_session *ps;
 
 	if (level != SOL_PPPOL2TP)
-		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
+		return -EINVAL;
 
 	if (get_user(len, (int __user *) optlen))
 		return -EFAULT;

--
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