SMS_ListMessageRequst() does not list unicode SMSs (remote denial of service exploit)

[ZakKemble]

1. SDK version（SDK 版本）

{ v2.129 }

---

2. In what kind of operation problems appear, and how to reproduce the problem ?（什么样的操作步骤问题会出现，是否是稳定复现，如何复现问题？）

{ SMS_ListMessageRequst(SMS_STATUS_ALL, SMS_STORAGE_SIM_CARD); does not list unicode SMSs (containing things like emojis 📞). This makes it rather difficult to delete the message as you have to guess the index number. }

---

[ZakKemble]

I've also found that this issue creates 2 remote denial of service exploits (if the attacker knows the phone number of the device using an A9/A9G):

1. Since unicode SMSs are not listed, they will probably never be deleted. This means an attacker can send a load of emoji texts to the device and fill up the SIM and flash storage, preventing further SMSs from being stored.
2. It also seems that when listing unicode SMSs, memory is allocated for them, but then never freed. This means each time SMS_ListMessageRequst() is called memory will be leaked for each unicode SMS. Eventually causing a heap overflow and crashing the A9G. (Tested on SDK v2.112 and v2.129)