From 49398a97c8441745a7410b9cf2b7af55a47e4b02 Mon Sep 17 00:00:00 2001
From: James Cherry <cherry@parallaxsw.com>
Date: Thu, 13 Jan 2022 16:12:27 -0700
Subject: [PATCH] null reader refs used by parsers after use

Signed-off-by: James Cherry <cherry@parallaxsw.com>
---
 liberty/LibertyExpr.cc   | 4 +++-
 parasitics/SpefReader.cc | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/liberty/LibertyExpr.cc b/liberty/LibertyExpr.cc
index 99b6eaa3..27f55601 100644
--- a/liberty/LibertyExpr.cc
+++ b/liberty/LibertyExpr.cc
@@ -39,7 +39,9 @@ parseFuncExpr(const char *func,
     LibExprParser parser(func, cell, error_msg, report);
     libexpr_parser = &parser;
     LibertyExprParse_parse();
-    return parser.result();
+    FuncExpr *expr = parser.result();
+    libexpr_parser = nullptr;
+    return expr;
   }
   else
     return nullptr;
diff --git a/parasitics/SpefReader.cc b/parasitics/SpefReader.cc
index ec865e9e..87d231c4 100644
--- a/parasitics/SpefReader.cc
+++ b/parasitics/SpefReader.cc
@@ -72,6 +72,7 @@ readSpefFile(const char *filename,
     // yyparse returns 0 on success.
     success = (::SpefParse_parse() == 0);
     gzclose(stream);
+    spef_reader = nullptr;
   }
   else
     throw FileNotReadable(filename);