Q: Given the following code slice:
```
1 static int nfs_net_init(struct net *net)
2 {
3 	struct nfs_net *nn = net_generic(net, nfs_net_id);
4 
5 	nfs_clients_init(net);
6 	rpc_proc_register(net, &nn->rpcstats);
7 	return nfs_fs_proc_net_init(net);
```
which has a vulnerability among CWE-476 and among lines:
```
6 	rpc_proc_register(net, &nn->rpcstats);
```
Please generate five possible patches for the vulnerability.