l2tp: prevent pppol2tp_connect() from creating kernel sockets

If 'fd' is negative, l2tp_tunnel_create() creates a tunnel socket using
the configuration passed in 'tcfg'. Currently, pppol2tp_connect() sets
the relevant fields to zero, tricking l2tp_tunnel_create() into setting
up an unusable kernel socket.

We can't set 'tcfg' with the required fields because there's no way to
get them from the current connect() parameters. So let's restrict
kernel sockets creation to the netlink API, which is the original use
case.

Fixes: 789a4a2c61d8 ("l2tp: Add support for static unmanaged L2TPv3 tunnels")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 8b3b6947a07d7f08127a444ec4e7089b7188cb80..1b24f76ae210e2f89d791aa96c2d60da091c6520 100644 (file)
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -701,6 +701,15 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
                                .encap = L2TP_ENCAPTYPE_UDP,
                                .debug = 0,
                        };
+
+                       /* Prevent l2tp_tunnel_register() from trying to set up
+                        * a kernel socket.
+                        */
+                       if (fd < 0) {
+                               error = -EBADF;
+                               goto end;
+                       }
+
                        error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
                        if (error < 0)
                                goto end;