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Message-Id: <20151207144920.042323135@linuxfoundation.org>
Date: Mon, 7 Dec 2015 09:54:57 -0500
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Guillaume Nault <g.nault@...halink.fr>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.2 007/124] ppp: fix pppoe_dev deletion condition in pppoe_release()
4.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Guillaume Nault <g.nault@...halink.fr>
[ Upstream commit 1acea4f6ce1b1c0941438aca75dd2e5c6b09db60 ]
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@...halink.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/net/ppp/pppoe.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -589,7 +589,7 @@ static int pppoe_release(struct socket *
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;
}
--
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