Apple Intel GPU Driver - Use-After-FreeDouble-Delete due to bad Locking

Apple Intel GPU Driver - Use-After-FreeDouble-Delete due to bad Locking / This PoC file might look familiar; this bug is a trivial variant of CVE-2016-1744 Apple bug id 635599405. That report showed the bug in the unmapusermemory external methods; a variant also exists in the mapusermemory extern...