[PATCH] NFS: populate ->net in mount data when remounting

[Mateusz Guzik]

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@xxxxxxxxxx>
Cc: linux-nfs@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # 3.4+
---
 fs/nfs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2cb5694..104ef01 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2248,6 +2248,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
 	data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
 	data->version = nfsvers;
 	data->minorversion = nfss->nfs_client->cl_minorversion;
+	data->net = current->nsproxy->net_ns;
 	memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
 		data->nfs_server.addrlen);
 
-- 
1.8.3.1

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