eldbus: Fix crash caused when the object of an monitored proxy is deleted

This happen because proxy was already freed and we try print some information
about the proxy in error message.

This fix: https://phab.enlightenment.org/T543

1 files changed, 15 insertions, 2 deletions

diff --git a/src/lib/eldbus/eldbus_proxy.c b/src/lib/eldbus/eldbus_proxy.c
index 9f027514d..fcd553aa9 100644
--- a/src/lib/eldbus/eldbus_proxy.c
+++ b/src/lib/eldbus/eldbus_proxy.c
@@ -728,13 +728,23 @@ _property_iter(void *data, const void *key, Eldbus_Message_Iter *var)
 }
 
 static void
-_props_get_all(void *data, const Eldbus_Message *msg, Eldbus_Pending *pending EINA_UNUSED)
+_on_monitored_proxy_del(void *data, Eldbus_Proxy *proxy EINA_UNUSED, void *event_info EINA_UNUSED)
+{
+   Eldbus_Pending *pending = data;
+   eldbus_pending_cancel(pending);
+}
+
+static void
+_props_get_all(void *data, const Eldbus_Message *msg, Eldbus_Pending *pending)
 {
    Eldbus_Proxy *proxy = data;
    Eldbus_Message_Iter *dict;
    const char *name, *error_msg;
    Eldbus_Proxy_Event_Property_Loaded event;
 
+   eldbus_proxy_event_callback_del(proxy, ELDBUS_PROXY_EVENT_DEL,
+                                   _on_monitored_proxy_del, pending);
+
    if (eldbus_message_error_get(msg, &name, &error_msg))
      {
         ERR("Error getting all properties of %s %s, error message: %s %s",
@@ -760,6 +770,7 @@ _props_get_all(void *data, const Eldbus_Message *msg, Eldbus_Pending *pending EI
 EAPI Eina_Bool
 eldbus_proxy_properties_monitor(Eldbus_Proxy *proxy, Eina_Bool enable)
 {
+   Eldbus_Pending *pending;
    ELDBUS_PROXY_CHECK_RETVAL(proxy, EINA_FALSE);
    if (proxy->monitor_enabled == enable)
      return proxy->props ? !!eina_hash_population(proxy->props) : EINA_FALSE;
@@ -787,7 +798,9 @@ eldbus_proxy_properties_monitor(Eldbus_Proxy *proxy, Eina_Bool enable)
    if (!proxy->props)
      proxy->props = eina_hash_string_superfast_new(_props_cache_free);
 
-   eldbus_proxy_property_get_all(proxy, _props_get_all, proxy);
+   pending = eldbus_proxy_property_get_all(proxy, _props_get_all, proxy);
+   eldbus_proxy_event_callback_add(proxy, ELDBUS_PROXY_EVENT_DEL,
+                                   _on_monitored_proxy_del, pending);
 
    if (proxy->properties_changed)
      return !!eina_hash_population(proxy->props);