Commit 1179c8f1 authored by Sasha Levin's avatar Sasha Levin Committed by Ben Hutchings

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

commit 3cf521f7 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: default avatarSasha Levin <sasha.levin@oracle.com>
Acked-by: default avatarJames Chapman <jchapman@katalix.com>
Acked-by: default avatarDavid Miller <davem@davemloft.net>
Cc: Phil Turnbull <phil.turnbull@oracle.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent f5040bb4
......@@ -1351,7 +1351,7 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
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 socket *sock, int level,
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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