Unable to free memory - c

Question

I'm new to C language
I use dbus_g_bus_get() to connect the Session Management signals:
static DBusGProxy * connect_to_session (void)
{
DBusGConnection *connection;
DBusGProxy *proxy;
GError *error = NULL;
connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error); /* line 1472 */
if (error) {
g_warning ("Couldn't connect to system bus: %s", error->message);
g_error_free(error);
return NULL;
}
/* Get the current session object */
proxy = dbus_g_proxy_new_for_name (connection,
"org.gnome.SessionManager",
"/org/gnome/SessionManager",
"org.gnome.SessionManager");
if (!proxy) {
g_warning ("Unable to get the SessionManager.");
dbus_g_connection_unref (connection);
return NULL;
}
dbus_g_proxy_add_signal (proxy, "SessionOver", G_TYPE_INVALID, G_TYPE_INVALID);
dbus_g_proxy_connect_signal (proxy, "SessionOver", G_CALLBACK (session_die_cb), NULL, NULL);
g_object_set_data (G_OBJECT (proxy), "connection", connection);
return proxy;
}
call this in main:
int main(int argc, char* argv[])
{
--------------------------------------------
/* Connect the Session Management signals */
proxy = connect_to_session ();
if (proxy) {
DBusGConnection *conn;
conn = (DBusGConnection *)g_object_get_data (G_OBJECT (proxy), "connection");
if (conn)
dbus_g_connection_unref (conn);
g_object_unref (proxy);
}
return 0;
}
and valgrind output this:
32 bytes in 1 blocks are possibly lost in loss record 5,342 of 13,110
at 0x4C2C6AE: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
by 0x6F2ABEE: g_realloc (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3703.0)
by 0x6CBC577: g_type_set_qdata (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.3703.0)
by 0x513A3D4: ??? (in /usr/lib/x86_64-linux-gnu/libdbus-glib-1.so.2.2.2)
by 0x512F48C: dbus_g_bus_get (in /usr/lib/x86_64-linux-gnu/libdbus-glib-1.so.2.2.2)
by 0x40B669: main (gui.c:1472)
I don't know if this report it is false or not.
Thanks

Answer 1

Valgrind has some issues dealing with glbal variables, there is a lot of posts hese at Stackoverflow. You are calling dbus_g_bus_get, and the return is a poiner to a global variable.
DBusGConnection* dbus_g_bus_get (DBusBusType type, GError **error);
Returns a connection to the given bus. The connection is a global variable shared with other callers of this function.
You could also try calling dbus_g_connection_ref after you get the connection.