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From: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Date: Mon, 20 Apr 2015 21:07:48 +0200
Subject: [PATCH] pppoe: Lacks DST MAC address check
A pppoe session is identified by its session ID and MAC address.
Currently pppoe does not check if the received pkg has the correct
MAC address. This is a problem when the eth I/F is in promisc mode
as then any DST MAC address is accepted.
Signed-off-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -379,6 +379,9 @@ static int pppoe_rcv_core(struct sock *s
* can't change.
*/
+ if (skb->pkt_type == PACKET_OTHERHOST)
+ goto abort_kfree;
+
if (sk->sk_state & PPPOX_BOUND) {
ppp_input(&po->chan, skb);
} else if (sk->sk_state & PPPOX_RELAY) {
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