From a205a0e9419f973346740171618956afe08b2d74 Mon Sep 17 00:00:00 2001
From: Tim Edwards <tim@opencircuitdesign.com>
Date: Mon, 21 Mar 2022 09:06:35 -0400
Subject: [PATCH] Corrected a potential segfault condition on "extract" if a
 cellname contains slashes (which makes it look like a full path).

---
 VERSION           |  2 +-
 extract/ExtCell.c | 15 +++++++++------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/VERSION b/VERSION
index 36621de1..f6f6ea20 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.277
+8.3.278
diff --git a/extract/ExtCell.c b/extract/ExtCell.c
index 4335c937..f441afe9 100644
--- a/extract/ExtCell.c
+++ b/extract/ExtCell.c
@@ -208,14 +208,17 @@ extFileOpen(def, file, mode, doLocal, prealfile)
     else
 	name = def->cd_name;
 
-    ends = strrchr(def->cd_file, '/');
-    if (ends != NULL)
+    if (def->cd_file)
     {
-	testf = PaOpen(ends + 1, "r", ".mag", ".", ".", NULL);
-	if (testf)
+	ends = strrchr(def->cd_file, '/');
+	if (ends != NULL)
 	{
-	    fclose(testf);
-	    return NULL;
+	    testf = PaOpen(ends + 1, "r", ".mag", ".", ".", NULL);
+	    if (testf)
+	    {
+		fclose(testf);
+		return NULL;
+	    }
 	}
     }
     return (PaOpen(name, mode, ".ext", ".", ".", prealfile));