mptcp: use sock_kfree_s instead of kfree

The local address entries on userspace_pm_local_addr_list are allocated
by sock_kmalloc(). It's better to use sock_kfree_s() to free each of them
and adjust the allocated size, instead of using kfree().

Fixes: 24430f8 ("mptcp: add address into userspace pm list")
Signed-off-by: Geliang Tang <[email protected]>

net/mptcp/pm_userspace.c

@@ -91,14 +91,15 @@ static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
 						struct mptcp_pm_addr_entry *addr)
 {
 	struct mptcp_pm_addr_entry *entry, *tmp;
+	struct sock *sk = (struct sock *)msk;
 
 	list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
 		if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
 			/* TODO: a refcount is needed because the entry can
 			 * be used multiple times (e.g. fullmesh mode).
 			 */
 			list_del_rcu(&entry->list);
-			kfree(entry);
+			sock_kfree_s(sk, entry, sizeof(*entry));
 			msk->pm.local_addr_used--;
 			return 0;
 		}