From b23776416118cc96348b4cde4ce0e88a35b8ef87 Mon Sep 17 00:00:00 2001
From: Marcel Hollerbach <marcel@osg.samsung.com>
Date: Sun, 5 Dec 2021 17:27:06 +0100
Subject: e_pointer: improve overall

do not allow a dangling pointer, and check all entities that require the
pointer object to be alive.
---
 src/bin/e_pointer.c         | 25 +++++++++++++++++++++++++
 src/modules/lokker/lokker.c |  4 ++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/bin/e_pointer.c b/src/bin/e_pointer.c
index 22a040fb44..dd4df9b90e 100644
--- a/src/bin/e_pointer.c
+++ b/src/bin/e_pointer.c
@@ -249,16 +249,27 @@ _e_pointer_cb_hot_show(void *data, Evas *evas EINA_UNUSED, Evas_Object *obj EINA
    _hot_update(ptr);
 }
 
+static void
+_del_cb(void *data, const Efl_Event *ev EINA_UNUSED) {
+  E_Pointer *ptr = data;
+  INF("Cursor-Object (%p) of %p was removed!", ptr->o_ptr, data);
+  ptr->o_ptr = NULL;
+  return;
+}
+
 static void
 _e_pointer_pointer_canvas_init(E_Pointer *ptr, Evas *e, Evas_Object **o_ptr, Evas_Object **o_hot)
 {
    /* create pointer object */
    *o_ptr = edje_object_add(e);
 
+   efl_event_callback_add(*o_ptr, EFL_EVENT_DEL, _del_cb, ptr);
+
    /* create hotspot object */
    *o_hot = evas_object_rectangle_add(e);
    evas_object_color_set(*o_hot, 0, 0, 0, 0);
 
+
    evas_object_event_callback_add(*o_hot, EVAS_CALLBACK_MOVE,
                                   _e_pointer_cb_hot_move, ptr);
    evas_object_event_callback_add(*o_ptr, EVAS_CALLBACK_MOVE,
@@ -622,6 +633,9 @@ e_pointer_hide(E_Pointer *ptr)
 E_API void
 e_pointer_show(E_Pointer *ptr)
 {
+   EINA_SAFETY_ON_NULL_RETURN(ptr);
+   EINA_SAFETY_ON_NULL_RETURN(ptr->o_ptr);
+
    if ((!ptr->buffer_evas) && ptr->win) _e_pointer_canvas_add(ptr);
    if (ptr->canvas)
      evas_object_show(ptr->o_ptr);
@@ -633,6 +647,7 @@ e_pointer_type_push(E_Pointer *ptr, void *obj, const char *type)
    E_Pointer_Stack *stack;
 
    EINA_SAFETY_ON_NULL_RETURN(ptr);
+   EINA_SAFETY_ON_NULL_RETURN(obj);
 
    _e_pointer_type_set(ptr, type);
 
@@ -788,6 +803,10 @@ e_pointer_idler_before(void)
      {
         if ((!ptr->e_cursor) || (!ptr->buffer_evas)) continue;
 
+        if (!ptr->o_ptr) {
+          EINA_SAFETY_ERROR("ptr->o_ptr is NULL should not be NULL!");
+        }
+
         if (ptr->hot.update)
           _e_pointer_type_set(ptr, ptr->type);
 
@@ -826,6 +845,9 @@ e_pointer_object_set(E_Pointer *ptr, Evas_Object *obj, int x, int y)
    E_Client *ec;
    int px, py;
 
+   EINA_SAFETY_ON_NULL_RETURN(ptr);
+   EINA_SAFETY_ON_NULL_RETURN(ptr->o_ptr);
+
    ecore_evas_cursor_get(ptr->ee, &o, NULL, &px, &py);
    if (o)
      {
@@ -872,6 +894,9 @@ e_pointer_window_add(E_Pointer *ptr, Ecore_Window win)
 E_API void
 e_pointer_grab_set(E_Pointer *ptr, Eina_Bool grab)
 {
+   EINA_SAFETY_ON_NULL_RETURN(ptr);
+   EINA_SAFETY_ON_NULL_RETURN(ptr->o_ptr);
+
    if (grab) ptr->grabcount++;
    else
      {
diff --git a/src/modules/lokker/lokker.c b/src/modules/lokker/lokker.c
index 59d4170020..67d79b77f3 100644
--- a/src/modules/lokker/lokker.c
+++ b/src/modules/lokker/lokker.c
@@ -920,7 +920,7 @@ lokker_lock(void)
    mlock(edd, sizeof(Lokker_Data));
 #endif
 
-   e_pointer_type_push(e_comp->pointer, e_comp->pointer, "default");
+   e_pointer_type_push(e_comp->pointer, edd, "default");
    E_LIST_FOREACH(e_comp->zones, _lokker_popup_add);
    total_zone_num = eina_list_count(e_comp->zones);
 
@@ -946,7 +946,7 @@ lokker_unlock(void)
 {
    e_auth_fprint_end();
    E_FREE_LIST(edd->elock_wnd_list, _lokker_popup_free);
-   e_pointer_type_pop(e_comp->pointer, e_comp->pointer, "default");
+   e_pointer_type_pop(e_comp->pointer, eed, "default");
    E_FREE_LIST(edd->handlers, ecore_event_handler_del);
    if (edd->move_handler) ecore_event_handler_del(edd->move_handler);
 
-- 
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