ppp: fix pppoe_dev deletion condition in pppoe_release()

commit 1acea4f6ce1b1c0941438aca75dd2e5c6b09db60 upstream.

We can't rely on PPPOX_ZOMBIE to decide whether to clear po->pppoe_dev.
PPPOX_ZOMBIE can be set by pppoe_disc_rcv() even when po->pppoe_dev is
NULL. So we have no guarantee that (sk->sk_state & PPPOX_ZOMBIE) implies
(po->pppoe_dev != NULL).
Since we're releasing a PPPoE socket, we want to release the pppoe_dev
if it exists and reset sk_state to PPPOX_DEAD, no matter the previous
value of sk_state. So we can just check for po->pppoe_dev and avoid any
assumption on sk->sk_state.

Fixes: 2b018d57ff18 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
index 1cce913..0f4a04d 100644 (file)
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -575,7 +575,7 @@ static int pppoe_release(struct socket *sock)
 
        po = pppox_sk(sk);
 
 
        po = pppox_sk(sk);
 

-       if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
+       if (po->pppoe_dev) {

                dev_put(po->pppoe_dev);
                po->pppoe_dev = NULL;
        }
                dev_put(po->pppoe_dev);
                po->pppoe_dev = NULL;
        }