29 lines
1.1 KiB
Diff
29 lines
1.1 KiB
Diff
From: Guillaume Nault <g.nault@alphalink.fr>
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Date: Thu, 22 Oct 2015 16:57:10 +0200
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Subject: [PATCH] ppp: fix pppoe_dev deletion condition in pppoe_release()
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We can't rely on PPPOX_ZOMBIE to decide whether to clear po->pppoe_dev.
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PPPOX_ZOMBIE can be set by pppoe_disc_rcv() even when po->pppoe_dev is
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NULL. So we have no guarantee that (sk->sk_state & PPPOX_ZOMBIE) implies
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(po->pppoe_dev != NULL).
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Since we're releasing a PPPoE socket, we want to release the pppoe_dev
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if it exists and reset sk_state to PPPOX_DEAD, no matter the previous
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value of sk_state. So we can just check for po->pppoe_dev and avoid any
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assumption on sk->sk_state.
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Fixes: 2b018d57ff18 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release")
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Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/drivers/net/ppp/pppoe.c
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+++ b/drivers/net/ppp/pppoe.c
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@@ -589,7 +589,7 @@ static int pppoe_release(struct socket *
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po = pppox_sk(sk);
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- if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
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+ if (po->pppoe_dev) {
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dev_put(po->pppoe_dev);
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po->pppoe_dev = NULL;
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}
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