core: rewind message before forwarding it

Forwarding messages that are not rewinded will drop data. Fix this for
cgroups-agent messages that we might remarshal before forwarding to the
system bus.

1 files changed, 11 insertions, 7 deletions

diff --git a/src/core/dbus.c b/src/core/dbus.c
index 80f7589f2..e000cccd1 100644
--- a/src/core/dbus.c
+++ b/src/core/dbus.c
@@ -88,15 +88,19 @@ static int signal_agent_released(sd_bus *bus, sd_bus_message *message, void *use
 
         manager_notify_cgroup_empty(m, cgroup);
 
-        if (m->running_as == SYSTEMD_SYSTEM && m->system_bus) {
-                /* If we are running as system manager, forward the
-                 * message to the system bus */
+        /* only forward to system bus if running as system instance */
+        if (m->running_as != SYSTEMD_SYSTEM || !m->system_bus)
+                return 0;
 
-                r = sd_bus_send(m->system_bus, message, NULL);
-                if (r < 0)
-                        log_warning_errno(r, "Failed to forward Released message: %m");
-        }
+        r = sd_bus_message_rewind(message, 1);
+        if (r < 0)
+                goto exit;
+
+        r = sd_bus_send(m->system_bus, message, NULL);
 
+exit:
+        if (r < 0)
+                log_warning_errno(r, "Failed to forward Released message: %m");
         return 0;
 }