This is similar to bug 22542, but in different code:

SVCXPRT *
svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path)
{
  bool_t madesock = FALSE;
  SVCXPRT *xprt;
  struct unix_rendezvous *r;
  struct sockaddr_un addr;
  socklen_t len = sizeof (struct sockaddr_in);

  if (sock == RPC_ANYSOCK)
    {
      if ((sock = __socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
	{
	  perror (_("svc_unix.c - AF_UNIX socket creation problem"));
	  return (SVCXPRT *) NULL;
	}
      madesock = TRUE;
    }
  memset (&addr, '\0', sizeof (addr));
  addr.sun_family = AF_UNIX;
  len = strlen (path) + 1;
  memcpy (addr.sun_path, path, len);
  len += sizeof (addr.sun_family);
[…]

There is no length check, either.