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pppoe: only process PADT targeted at local interfaces 

[ Upstream commit b8c1583951 ]

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: 1da177e4c3 ("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>
5.4-rM2-2.2.x-imx-squashed
Guillaume Nault 2020-05-14 12:15:39 +02:00 committed by Greg Kroah-Hartman
parent ecb8356aaf
commit 5f93b45fa5
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ppp/pppoe.c
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@ -492,6 +492,9 @@ 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;