linux-kernel - [PATCH 3.2 081/126] rtnl: reset calcit fptr in rtnl

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Date:   Wed, 15 Feb 2017 22:41:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Jeff Kirsher" <jeffrey.t.kirsher@...el.com>,
        "Greg Rose" <gregory.v.rose@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Mathias Krause" <minipli@...glemail.com>
Subject: [PATCH 3.2 081/126] rtnl: reset calcit fptr in rtnl_unregister()

3.2.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Mathias Krause <minipli@...glemail.com>

commit f567e950bf51290755a2539ff2aaef4c26f735d3 upstream.

To avoid having dangling function pointers left behind, reset calcit in
rtnl_unregister(), too.

This is no issue so far, as only the rtnl core registers a netlink
handler with a calcit hook which won't be unregistered, but may become
one if new code makes use of the calcit hook.

Fixes: c7ac8679bec9 ("rtnetlink: Compute and store minimum ifinfo...")
Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: Greg Rose <gregory.v.rose@...el.com>
Signed-off-by: Mathias Krause <minipli@...glemail.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/core/rtnetlink.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -249,6 +249,7 @@ int rtnl_unregister(int protocol, int ms
 
 	rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 	rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
+	rtnl_msg_handlers[protocol][msgindex].calcit = NULL;
 
 	return 0;
 }