linux-kernel - [PATCH 3.10 256/319] packet: call fanout_release, while UNREGISTERING a netdev

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Message-Id: <1486322541-8206-157-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:21:18 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Anoob Soman <anoob.soman@...rix.com>,
        "David S . Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 256/319] packet: call fanout_release, while UNREGISTERING a netdev

From: Anoob Soman <anoob.soman@...rix.com>

commit 6664498280cf17a59c3e7cf1a931444c02633ed1 upstream.

If a socket has FANOUT sockopt set, a new proto_hook is registered
as part of fanout_add(). When processing a NETDEV_UNREGISTER event in
af_packet, __fanout_unlink is called for all sockets, but prot_hook which was
registered as part of fanout_add is not removed. Call fanout_release, on a
NETDEV_UNREGISTER, which removes prot_hook and removes fanout from the
fanout_list.

This fixes BUG_ON(!list_empty(&dev->ptype_specific)) in netdev_run_todo()

Signed-off-by: Anoob Soman <anoob.soman@...rix.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/packet/af_packet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 2d454a2..24f0066 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3384,6 +3384,7 @@ static int packet_notifier(struct notifier_block *this, unsigned long msg, void
 				}
 				if (msg == NETDEV_UNREGISTER) {
 					packet_cached_dev_reset(po);
+					fanout_release(sk);
 					po->ifindex = -1;
 					if (po->prot_hook.dev)
 						dev_put(po->prot_hook.dev);
-- 
2.8.0.rc2.1.gbe9624a