CVE-2024-6443 zephyr: out-of-bound read in utf8_trunc

In utf8trunc in zephyr/lib/utils/utf8.c, lastbytep can point to one byte before the string pointer if the string is empty...

Zephyr 安全漏洞

Zephyr is an extensible real-time operating system RTOS open-sourced by Zephyr. A security vulnerability exists in Zephyr that stems from the ability to point to the previous byte of a string pointer if the lastbytep string is null...