pppoe: only process PADT targeted at local interfaces

[ Upstream commit b8c158395119be62294da73646a3953c29ac974b ]

We don't want to disconnect a session because of a stray PADT arriving
while the interface is in promiscuous mode.
Furthermore, multicast and broadcast packets make no sense here, so
only PACKET_HOST is accepted.

Reported-by: David Balažic <xerces9@gmail.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
index c04f3dc17d76f1c6d476faae5542975ef1c2707b..b8342162f3a04f4d13668c0fc5ed84c759d91da2 100644 (file)
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -497,6 +497,9 @@ static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
        if (!skb)
                goto out;
 
+       if (skb->pkt_type != PACKET_HOST)
+               goto abort;
+
        if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
                goto abort;