timedate: increment reference count of sd_bus_message

The commit 5d280742b645a69a19e7f9131adc0c95f5c7fa07 introduces a
barrier to suppress calling context_update_ntp_status() multiple times.
However, it just stores the address of sd_bus_message object. So,
when an address is reused on the subsequent message, then the status
of NTP clients are not updated.

This makes the stored message object is referenced by the context
object. So, the subsequent message is on cirtainly different address.

diff --git a/src/timedate/timedated.c b/src/timedate/timedated.c
index 4beded5..6c95764 100644 (file)
--- a/src/timedate/timedated.c
+++ b/src/timedate/timedated.c
@@ -44,6 +44,7 @@ typedef struct Context {
         char *zone;
         bool local_rtc;
         Hashmap *polkit_registry;
+        sd_bus_message *cache;
 
         LIST_HEAD(UnitStatusInfo, units);
 } Context;
@@ -71,6 +72,7 @@ static void context_free(Context *c) {
 
         free(c->zone);
         bus_verify_polkit_async_registry_free(c->polkit_registry);
+        sd_bus_message_unref(c->cache);
 
         while ((p = c->units)) {
                 LIST_REMOVE(units, c->units, p);
@@ -302,18 +304,20 @@ static int context_update_ntp_status(Context *c, sd_bus *bus, sd_bus_message *m)
                 { "UnitFileState", "s", NULL, offsetof(UnitStatusInfo, unit_file_state) },
                 {}
         };
-        static sd_bus_message *_m = NULL;
         UnitStatusInfo *u;
         int r;
 
         assert(c);
         assert(bus);
 
-        /* Suppress multiple call of context_update_ntp_status() within single DBus transaction. */
-        if (m && m == _m)
-                return 0;
+        /* Suppress calling context_update_ntp_status() multiple times within single DBus transaction. */
+        if (m) {
+                if (m == c->cache)
+                        return 0;
 
-        _m = m;
+                sd_bus_message_unref(c->cache);
+                c->cache = sd_bus_message_ref(m);
+        }
 
         LIST_FOREACH(units, u, c->units) {
                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;