ipt_recent: fix race between recent_mt_destroy and proc manipulations

The thing is that recent_mt_destroy first flushes the entries from table with the recent_table_flush and only *after* this removes the proc file, corresponding to that table.

Thus, if we manage to write to this file the '+XXX' command we will leak some entries. If we manage to write there a 'clean' command we'll race in two recent_table_flush flows, since the recent_mt_destroy calls this outside the recent_lock.

The proper solution as I see it is to remove the proc file first and then go on with flushing the table. This flushing becomes safe w/o the lock, since the table is already inaccessible from the outside.

---

index 21cb053..3974d7c 100644
@@ -305,10 +305,10 @@ static void recent_mt_destroy(const struct xt_match *match, void *matchinfo)
 		spin_lock_bh(&recent_lock);
 		list_del(&t->list);
 		spin_unlock_bh(&recent_lock);
-		recent_table_flush(t);
 #ifdef CONFIG_PROC_FS
 		remove_proc_entry(t->name, proc_dir);
 #endif
+		recent_table_flush(t);
 		kfree(t);
 	}
 	mutex_unlock(&recent_mutex);

Applied, thanks.