Merge branch 'check_before_use' into 'master'

check for valid drv_base and valid drv_entry in HMDM-VDM before use

See merge request _xeroxz/hmdm!2

HMDM-VDM/main.cpp

@@ -67,17 +67,19 @@ int __cdecl main(int argc, char** argv)
 	const auto [drv_base, drv_entry] = drv_mapper.map_module(drv_buffer);
 	std::printf("> driver base -> 0x%p, driver entry -> 0x%p\n", drv_base, drv_entry);
 
+	if (!drv_base || !drv_entry)
+	{
+		std::printf("> failed to map driver...\n");
+		return -1;
+	}
+	
 	// call driver entry... its up to you to do this using whatever method...
 	// with VDM you can syscall into it... with msrexec you will use msrexec::exec...
 	const auto entry_result = vdm.syscall<NTSTATUS(*)(std::uintptr_t)>(
 		reinterpret_cast<void*>(drv_entry), drv_base);
 
 	std::printf("> entry result -> 0x%p\n", entry_result);
-	if (!drv_base || !drv_entry)
-	{
-		std::printf("> failed to map driver...\n");
-		return -1;
-	}
+	
 
 	const auto unload_status = vdm::unload_drv(drv_handle, drv_key);
 	if (unload_status != STATUS_SUCCESS)