From: Anoob Soman <anoob.soman@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ Upstream commit 6664498280cf17a59c3e7cf1a931444c02633ed1 ]
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@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
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 1e9cb9921daa..3f9804b2802a 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3365,6 +3365,7 @@ static int packet_notifier(struct notifier_block *this,
}
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);
--
2.10.2
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