14025 ipnet sniffing leaks promisc mode

*** 24,34 ****
   * Use is subject to license terms.
   * Copyright (c) 2016 by Delphix. All rights reserved.
   */
  
  /*
!  * Copyright (c) 2016, Joyent, Inc. All rights reserved.
   */
  
  /*
   * The ipnet device defined here provides access to packets at the IP layer. To
   * provide access to packets at this layer it registers a callback function in
--- 24,34 ----
   * Use is subject to license terms.
   * Copyright (c) 2016 by Delphix. All rights reserved.
   */
  
  /*
!  * Copyright 2021 Joyent, Inc.
   */
  
  /*
   * The ipnet device defined here provides access to packets at the IP layer. To
   * provide access to packets at this layer it registers a callback function in
*** 2243,2252 ****
--- 2243,2253 ----
  
  regfail:
          cmn_err(CE_WARN, "net_hook_register failed: %d", error);
          strfree(ipnet->ipnet_hook->h_name);
          hook_free(ipnet->ipnet_hook);
+         ipnet_leave_allmulti(ifp, ns->netstack_ipnet);
          netstack_rele(ns);
          return (error);
  }
  
  void
*** 2268,2277 ****
--- 2269,2280 ----
  
          strfree(hook->h_name);
  
          hook_free(hook);
  
+         ipnet_leave_allmulti(ipnet->ipnet_if, ipnet->ipnet_ns->netstack_ipnet);
+ 
          kmem_free(ipnet, sizeof (*ipnet));
  }
  
  /*
   * arg here comes from the ipnet_t allocated in ipnet_promisc_add.