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[4.9,12/42] pppoe: only process PADT targeted at local interfaces

Message ID 20200609174016.816264928@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH June 9, 2020, 5:44 p.m. UTC 
From: Guillaume Nault <gnault@redhat.com>

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>
---
 drivers/net/ppp/pppoe.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
index fa8f7c40a384..804c52c35f07 100644
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -494,6 +494,9 @@  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;