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    Subject[PATCH 5.4 023/147] pppoe: only process PADT targeted at local interfaces
    Date
    From: Guillaume Nault <gnault@redhat.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@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>
    ---
    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;


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