Fix T100527: Right click in the attribute name field crashes blender.

`UI_context_active_but_prop_get_templateID` became much more widely used
with recent rBfec254364884, which revealed that it did not do any check
on actual type of data it accesses, resulting easily in undefined
behavior.

Now also check the callback function pointer, this should be safe
enough.

Patch by @Severin (Julian Eisel), many thanks!

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/editors/interface/interface_templates.c b/source/blender/editors/interface/interface_templates.c
index f3912eed9d6..37139e8d078 100644
--- a/source/blender/editors/interface/interface_templates.c
+++ b/source/blender/editors/interface/interface_templates.c
@@ -571,8 +571,11 @@ static uiBlock *id_search_menu(bContext *C, ARegion *region, void *arg_litem)
 /** \name ID Template
  * \{ */
 
-/* This is for browsing and editing the ID-blocks used */
+static void template_id_cb(bContext *C, void *arg_litem, void *arg_event);
 
+/**
+ * This is for browsing and editing the ID-blocks used.
+ */
 void UI_context_active_but_prop_get_templateID(bContext *C,
                                                PointerRNA *r_ptr,
                                                PropertyRNA **r_prop)
@@ -582,7 +585,7 @@ void UI_context_active_but_prop_get_templateID(bContext *C,
   memset(r_ptr, 0, sizeof(*r_ptr));
   *r_prop = NULL;
 
-  if (but && but->func_argN) {
+  if (but && (but->funcN == template_id_cb) && but->func_argN) {
     TemplateID *template_ui = but->func_argN;
     *r_ptr = template_ui->ptr;
     *r_prop = template_ui->prop;