int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
{
	nfs4_verifier verifier;
	struct nfs41_exchange_id_args args = {
		.verifier = &verifier,
		.client = clp,
		.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
	};
	struct nfs41_exchange_id_res res = {
		0
	};
	int status;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = cred,
	};

	nfs4_init_boot_verifier(clp, &verifier);
	args.id_len = nfs4_init_uniform_client_string(clp, args.id,
							sizeof(args.id));
	dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
		clp->cl_rpcclient->cl_auth->au_ops->au_name,
		args.id_len, args.id);

	res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
					GFP_NOFS);
	if (unlikely(res.server_owner == NULL)) {
		status = -ENOMEM;
		goto out;
	}

	res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
					GFP_NOFS);
	if (unlikely(res.server_scope == NULL)) {
		status = -ENOMEM;
		goto out_server_owner;
	}

	res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
	if (unlikely(res.impl_id == NULL)) {
		status = -ENOMEM;
		goto out_server_scope;
	}

	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
	if (status == 0)
		status = nfs4_check_cl_exchange_flags(res.flags);

	if (status == 0) {
		clp->cl_clientid = res.clientid;
		clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
		if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
			clp->cl_seqid = res.seqid;

		kfree(clp->cl_serverowner);
		clp->cl_serverowner = res.server_owner;
		res.server_owner = NULL;

		/* use the most recent implementation id */
		kfree(clp->cl_implid);
		clp->cl_implid = res.impl_id;

		if (clp->cl_serverscope != NULL &&
		    !nfs41_same_server_scope(clp->cl_serverscope,
					     res.server_scope)) {
			dprintk("%s: server_scope mismatch detected\n",
				__func__);
			set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
			kfree(clp->cl_serverscope);
			clp->cl_serverscope = NULL;
		}

		if (clp->cl_serverscope == NULL) {
			clp->cl_serverscope = res.server_scope;
			goto out;
		}
	} else
		kfree(res.impl_id);

out_server_owner:
	kfree(res.server_owner);
out_server_scope:
	kfree(res.server_scope);
out:
	if (clp->cl_implid != NULL)
		dprintk("NFS reply exchange_id: Server Implementation ID: "
			"domain: %s, name: %s, date: %llu,%u\n",
			clp->cl_implid->domain, clp->cl_implid->name,
			clp->cl_implid->date.seconds,
			clp->cl_implid->date.nseconds);
	dprintk("NFS reply exchange_id: %d\n", status);
	return status;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.