From 78be76a65075fc338da3c22514c2f9047745935a Mon Sep 17 00:00:00 2001
From: Tim Edwards <tim@opencircuitdesign.com>
Date: Sat, 5 Jun 2021 17:02:39 -0400
Subject: [PATCH] Corrected a potential crash condition if attempting to read a
 GDS cell without any edit cell defined.

---
 VERSION           | 2 +-
 calma/CalmaRead.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/VERSION b/VERSION
index bd9847a9..fd696242 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.173
+8.3.174
diff --git a/calma/CalmaRead.c b/calma/CalmaRead.c
index 9857f8d0..64139209 100644
--- a/calma/CalmaRead.c
+++ b/calma/CalmaRead.c
@@ -164,6 +164,12 @@ CalmaReadFile(file, filename)
     static int skipBeforeLib[] = { CALMA_LIBDIRSIZE, CALMA_SRFNAME,
 				   CALMA_LIBSECUR, -1 };
 
+    if (EditCellUse == (CellUse *)NULL)
+    {
+	TxError("Cannot read GDS:  There is no edit cell.\n");
+	return
+    }
+
     /* We will use full cell names as keys in this hash table */
     CIFReadCellInit(0);