netdev - [PATCH 5/6] vti6: Don't unregister pernet ops twice on init errors

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Date:	Thu, 15 May 2014 09:07:55 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	David Miller <davem@...emloft.net>
CC:	Herbert Xu <herbert@...dor.apana.org.au>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	<netdev@...r.kernel.org>
Subject: [PATCH 5/6] vti6: Don't unregister pernet ops twice on init errors

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

If we fail to register one of the xfrm protocol handlers we will
unregister the pernet ops twice on the error exit path. This will
probably lead to a kernel panic as the double deregistration
leads to a double kfree().

Fix this by removing one of the calls to do it only once.

Fixes: fa9ad96d49 ("vti6: Update the ipv6 side to use its own...")
Signed-off-by: Mathias Krause <minipli@...glemail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/ipv6/ip6_vti.c |    3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index b7c0f82..a511003 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -1097,7 +1097,6 @@ static int __init vti6_tunnel_init(void)
 
 	err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
 	if (err < 0) {
-		unregister_pernet_device(&vti6_net_ops);
 		pr_err("%s: can't register vti6 protocol\n", __func__);
 
 		goto out;
@@ -1106,7 +1105,6 @@ static int __init vti6_tunnel_init(void)
 	err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
 	if (err < 0) {
 		xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
-		unregister_pernet_device(&vti6_net_ops);
 		pr_err("%s: can't register vti6 protocol\n", __func__);
 
 		goto out;
@@ -1116,7 +1114,6 @@ static int __init vti6_tunnel_init(void)
 	if (err < 0) {
 		xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
 		xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
-		unregister_pernet_device(&vti6_net_ops);
 		pr_err("%s: can't register vti6 protocol\n", __func__);
 
 		goto out;
-- 
1.7.9.5

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