linux-kernel - [PATCH 3.11 113/198] NFS: populate ->net in mount data when remounting

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Message-Id: <1404379241-8590-114-git-send-email-luis.henriques@canonical.com>
Date:	Thu,  3 Jul 2014 10:19:16 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Mateusz Guzik <mguzik@...hat.com>, linux-nfs@...r.kernel.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 113/198] NFS: populate ->net in mount data when remounting

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

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

From: Mateusz Guzik <mguzik@...hat.com>

commit a914722f333b3359d2f4f12919380a334176bb89 upstream.

Otherwise the kernel oopses when remounting with IPv6 server because
net is dereferenced in dev_get_by_name.

Use net ns of current thread so that dev_get_by_name does not operate on
foreign ns. Changing the address is prohibited anyway so this should not
affect anything.

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
Cc: linux-nfs@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/nfs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index f6db66d8f647..928bb8c1680e 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2178,6 +2178,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
 	data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
 	data->nfs_server.port = nfss->port;
 	data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
+	data->net = current->nsproxy->net_ns;
 	memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
 		data->nfs_server.addrlen);
 
-- 
1.9.1

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