linux-kernel - [PATCH 3.16.y-ckt 161/180] vti6: fix uninit when using x-netns

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Message-Id: <1430991989-23170-162-git-send-email-luis.henriques@canonical.com>
Date:	Thu,  7 May 2015 10:46:10 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Yao Xiwei <xiwei.yao@...nd.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 161/180] vti6: fix uninit when using x-netns

3.16.7-ckt11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Yao Xiwei <xiwei.yao@...nd.com>

commit 092a29a40bab8bb4530bb3e58a0597001cdecdef upstream.

When the kernel deleted a vti6 interface, this interface was not removed from
the tunnels list. Thus, when the ip6_vti module was removed, this old interface
was found and the kernel tried to delete it again. This was leading to a kernel
panic.

Fixes: 61220ab34948 ("vti6: Enable namespace changing")
Signed-off-by: Yao Xiwei <xiwei.yao@...nd.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/ipv6/ip6_vti.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index 7c6e6bfb1b0f..4e083dab7445 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -267,8 +267,7 @@ static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
 static void vti6_dev_uninit(struct net_device *dev)
 {
 	struct ip6_tnl *t = netdev_priv(dev);
-	struct net *net = dev_net(dev);
-	struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+	struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
 
 	if (dev == ip6n->fb_tnl_dev)
 		RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
--
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