From 50a863bb2685f01c656f97df3254de681808b172 Mon Sep 17 00:00:00 2001
From: klayoutmatthias <matthias@klayout.org>
Date: Tue, 26 Jul 2022 00:13:26 +0200
Subject: [PATCH] [Consider merging] Fixed a potential memory corruption
 problem

---
 src/db/db/dbStreamLayers.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/db/db/dbStreamLayers.cc b/src/db/db/dbStreamLayers.cc
index c29945d1f..7c8625ce4 100644
--- a/src/db/db/dbStreamLayers.cc
+++ b/src/db/db/dbStreamLayers.cc
@@ -787,7 +787,7 @@ LayerMap::unmap (const LDPair &p1, const LDPair &p2)
   if (db::is_static_ld (p1.layer) && db::is_static_ld (p2.layer)) {
     m_ld_map.add (p1.layer, p2.layer + 1, LayerMap::datatype_map (), op);
   } else {
-    m_ld_map.add (m_ld_map.begin ()->first.first, m_ld_map.end ()->first.second, LayerMap::datatype_map (), op);
+    m_ld_map.add (m_ld_map.begin ()->first.first, (--m_ld_map.end ())->first.second, LayerMap::datatype_map (), op);
   }
 }