| Message ID | 6d523b6a290ac01939c29e7e4e0ec9b96c9c9d8f.1529065935.git.g.nault@alphalink.fr |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
| Series | l2tp: l2tp_ppp must ignore non-PPP sessions | expand |
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index f429fed06a1e..55188382845c 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1201,7 +1201,7 @@ static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, l2tp_session_get(sock_net(sk), tunnel, stats.session_id); - if (session) { + if (session && session->pwtype == L2TP_PWTYPE_PPP) { err = pppol2tp_session_ioctl(session, cmd, arg); l2tp_session_dec_refcount(session);
pppol2tp_tunnel_ioctl() can act on an L2TPv3 tunnel, in which case 'session' may be an Ethernet pseudo-wire. However, pppol2tp_session_ioctl() expects a PPP pseudo-wire, as it assumes l2tp_session_priv() points to a pppol2tp_session structure. For an Ethernet pseudo-wire l2tp_session_priv() points to an l2tp_eth_sess structure instead, making pppol2tp_session_ioctl() access invalid memory. Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support") Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> --- net/l2tp/l2tp_ppp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)