linux-kernel - [PATCH 5.4 023/147] pppoe: only process PADT targeted at local interfaces

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Date:   Mon, 18 May 2020 19:35:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        David Balažic <xerces9@...il.com>,
        Guillaume Nault <gnault@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 023/147] pppoe: only process PADT targeted at local interfaces

From: Guillaume Nault <gnault@...hat.com>

[ 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@...il.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Guillaume Nault <gnault@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ppp/pppoe.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -492,6 +492,9 @@ static int pppoe_disc_rcv(struct sk_buff
 	if (!skb)
 		goto out;
 
+	if (skb->pkt_type != PACKET_HOST)
+		goto abort;
+
 	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
 		goto abort;