Microsoft Windows Kernel - WindowStation Use-After-Free (MS15-061)

Source: https://code.google.com/p/google-security-research/issues/detail?id=295

Platform: Win7 32-bit.
trigger.cpp should fire the issue, with caveats:
- PoC MUST be compiled in release mode.
- PoC may need to be run a few times to trigger the crash.

Analysis is attached as a text file.

Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38273.zip