Usb

How buffer overflow in memcpy() happens in C/C++ embedded firmware and how to fix it

A critical buffer overflow vulnerability was discovered in the ESP32-based micro-journal firmware where `memcpy()` calls used `strlen()` without bounds checking, allowing oversized USB descriptor strings to corrupt adjacent memory. The fix replaces unbounded `strlen()` with `strnlen()` calls that enforce the destination buffer sizes (8, 16, and 4 bytes respectively), preventing heap/stack corruption from malicious USB devices.