Commit 06a15f51 authored by Alexander Couzens's avatar Alexander Couzens Committed by David S. Miller

l2tp: protect tunnel->del_work by ref_count

There is a small chance that tunnel_free() is called before tunnel->del_work scheduled
resulting in a zero pointer dereference.
Signed-off-by: default avatarAlexander Couzens <lynxis@fe80.eu>
Acked-by: default avatarJames Chapman <jchapman@katalix.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 661dfc65
......@@ -1319,7 +1319,7 @@ static void l2tp_tunnel_del_work(struct work_struct *work)
tunnel = container_of(work, struct l2tp_tunnel, del_work);
sk = l2tp_tunnel_sock_lookup(tunnel);
if (!sk)
return;
goto out;
sock = sk->sk_socket;
......@@ -1341,6 +1341,8 @@ static void l2tp_tunnel_del_work(struct work_struct *work)
}
l2tp_tunnel_sock_put(sk);
out:
l2tp_tunnel_dec_refcount(tunnel);
}
/* Create a socket for the tunnel, if one isn't set up by
......@@ -1636,8 +1638,13 @@ EXPORT_SYMBOL_GPL(l2tp_tunnel_create);
*/
int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel)
{
l2tp_tunnel_inc_refcount(tunnel);
l2tp_tunnel_closeall(tunnel);
return (false == queue_work(l2tp_wq, &tunnel->del_work));
if (false == queue_work(l2tp_wq, &tunnel->del_work)) {
l2tp_tunnel_dec_refcount(tunnel);
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(l2tp_tunnel_delete);
......
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