mptcp: pm: in-kernel: use kmemdup helper

Instead of using kmalloc() or kzalloc() to allocate an entry and
then immediately duplicate another entry to the newly allocated
one, kmemdup() helper can be used to simplify the code.

Signed-off-by: Geliang Tang <[email protected]>

Author: Geliang Tang

net/mptcp/pm_netlink.c

@@ -1156,11 +1156,10 @@ int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk,
 		return ret;
 
 	/* address not found, add to local list */
-	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+	entry = kmemdup(skc, sizeof(*skc), GFP_ATOMIC);
 	if (!entry)
 		return -ENOMEM;
 
-	*entry = *skc;
 	entry->addr.port = 0;
 	ret = mptcp_pm_nl_append_new_local_addr(pernet, entry, true);
 	if (ret < 0)
@@ -1422,13 +1421,12 @@ int mptcp_pm_nl_add_addr_doit(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 	}
 
-	entry = kzalloc(sizeof(*entry), GFP_KERNEL_ACCOUNT);
+	entry = kmemdup(&addr, sizeof(addr), GFP_KERNEL_ACCOUNT);
 	if (!entry) {
 		GENL_SET_ERR_MSG(info, "can't allocate addr");
 		return -ENOMEM;
 	}
 
-	*entry = addr;
 	if (entry->addr.port) {
 		ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry);
 		if (ret) {