VOID *__fastcall KeAllocateCalloutStack(INT64 LargeStack){ int v1; CHAR *v2; CHAR *v4; v4 = 0i64; v1 = KeAllocateCalloutStackEx((_BYTE)LargeStack != 0, 1u, 0i64, &v4); v2 = v4; if( v1 < 0 ) return 0i64; return v2; }