Patch "net/l2tp: don't fall back on UDP [get|set]sockopt" has been added to the 3.15-stable tree

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This is a note to let you know that I've just added the patch titled

    net/l2tp: don't fall back on UDP [get|set]sockopt

to the 3.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-l2tp-don-t-fall-back-on-udp-sockopt.patch
and it can be found in the queue-3.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 3cf521f7dc87c031617fd47e4b7aa2593c2f3daf Mon Sep 17 00:00:00 2001
From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Date: Mon, 14 Jul 2014 17:02:31 -0700
Subject: net/l2tp: don't fall back on UDP [get|set]sockopt

From: Sasha Levin <sasha.levin@xxxxxxxxxx>

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@xxxxxxxxxx>
Acked-by: James Chapman <jchapman@xxxxxxxxxxx>
Acked-by: David Miller <davem@xxxxxxxxxxxxx>
Cc: Phil Turnbull <phil.turnbull@xxxxxxxxxx>
Cc: Vegard Nossum <vegard.nossum@xxxxxxxxxx>
Cc: Willy Tarreau <w@xxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 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
@@ -1365,7 +1365,7 @@ 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;
@@ -1491,7 +1491,7 @@ 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, optlen))
 		return -EFAULT;


Patches currently in stable-queue which might be from sasha.levin@xxxxxxxxxx are

queue-3.15/net-l2tp-don-t-fall-back-on-udp-sockopt.patch
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