From 4f431cc6a38b025734694864f4af5dd8ea12dd10 Mon Sep 17 00:00:00 2001
From: Reini Urban <rurban@cpan.org>
Date: Sun, 6 Feb 2022 20:01:21 +0100
Subject: [PATCH] dwg_next_entity: fix immediate cycles

but we cannot yet detect non-immediate cycles, as from
illegal, fuzzed DWGs. See GH #345
---
 src/dwg.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/dwg.c b/src/dwg.c
index a6a959adf3..a010085d34 100644
--- 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;
     }