dwg_next_entity: fix immediate cycles

but we cannot yet detect non-immediate cycles, as from illegal, fuzzed DWGs. See GH #345
LibreDWG · Feb 6, 2022 · 4f431cc · 4f431cc
1 parent 84c34be
commit 4f431cc
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/dwg.c b/src/dwg.c
@@ -1095,7 +1095,10 @@ dwg_next_entity (const Dwg_Object *restrict obj)
         goto next_obj;
       next = obj->tio.entity->next_entity;
       if (next && next->absolute_ref)
-        return dwg_ref_object_silent (obj->parent, next);
+        {
+          Dwg_Object *next_obj = dwg_ref_object_silent (obj->parent, next);
+          return (obj == next_obj) ? NULL : next_obj;
+        }
       else
         goto next_obj;
     }