Merge pull request freeswitch#73 from freeswitch/shutdownleak

Fix leaking handles on nua shutdown.

libsofia-sip-ua/nua/nua.c

@@ -215,6 +215,7 @@ void nua_shutdown(nua_t *nua)
  */
 void nua_destroy(nua_t *nua)
 {
+  nua_handle_t *nh, *nh_next;
   enter;
 
   if (nua) {
@@ -234,6 +235,24 @@ void nua_destroy(nua_t *nua)
 #if HAVE_SMIME		/* Start NRC Boston */
     sm_destroy(nua->sm);
 #endif			/* End NRC Boston */
+
+    /* Cleanup remaining nua handles as they are su_home_new'ed and not su_home_cloned (do not belong to the nua's home)
+       See nh_create_handle().
+    */
+    for (nh = nua->nua_handles; nh; nh = nh_next) {
+      su_home_t *nh_home = (su_home_t *)nh;
+      nh_next = nh->nh_next;
+
+      /* at least one handle will be found here and it is nua default handle
+         which is su_home_cloned (see nua_stack_init()) and therefore does not actually require to be unrefed
+         but it is safe to do that anyways just for sure
+      */
+      SU_DEBUG_9(("nua(%p): found handle with refcount = "MOD_ZU". Destroying.\n", (void *)nh, su_home_refcount(nh_home)));
+
+      /* nua is about to die so we don't remove nh from nua, just unref nh */
+      while(!su_home_unref(nh_home));
+    }
+
 	nua_unref(nua);
   }
 }