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[PATCH net-next] net: Initialise init_net.count to 1

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  [PATCH net-next] net: Initialise init_net.count to 1 David Howells <dhowells@redhat.com> - 2017-04-27 23:50 +0200
    Re: [PATCH net-next] net: Initialise init_net.count to 1 David Miller <davem@davemloft.net> - 2017-05-01 04:40 +0200

#1632390 — [PATCH net-next] net: Initialise init_net.count to 1

Initialise init_net.count to 1 for its pointer from init_nsproxy lest
someone tries to do a get_net() and a put_net() in a process in which
current->ns_proxy->net_ns points to the initial network namespace.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/core/net_namespace.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 652468ff65b7..adb97ca141b7 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -35,7 +35,8 @@ LIST_HEAD(net_namespace_list);
 EXPORT_SYMBOL_GPL(net_namespace_list);
 
 struct net init_net = {
-	.dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head),
+	.count		= ATOMIC_INIT(1),
+	.dev_base_head	= LIST_HEAD_INIT(init_net.dev_base_head),
 };
 EXPORT_SYMBOL(init_net);
 

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#1633525

From: David Howells <dhowells@redhat.com>
Date: Thu, 27 Apr 2017 22:40:23 +0100

> Initialise init_net.count to 1 for its pointer from init_nsproxy lest
> someone tries to do a get_net() and a put_net() in a process in which
> current->ns_proxy->net_ns points to the initial network namespace.
> 
> Signed-off-by: David Howells <dhowells@redhat.com>

Applied.

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