From ab28c56fd39f0edc24e2765d5b69b7f7c21d9d71 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Tue, 11 Jun 1996 18:33:14 +0000
Subject: Avoid core dump on symcomp("").

---
 Modules/regexmodule.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Modules/regexmodule.c b/Modules/regexmodule.c
index 893f4fc..33801af 100644
--- a/Modules/regexmodule.c
+++ b/Modules/regexmodule.c
@@ -398,6 +398,11 @@ symcomp(pattern, gdict)
 	object *npattern;
 	int require_escape = re_syntax & RE_NO_BK_PARENS ? 0 : 1;
 
+	if (oend == opat) {
+		INCREF(pattern);
+		return pattern;
+	}
+
 	npattern = newsizedstringobject((char*)NULL, getstringsize(pattern));
 	if (npattern == NULL)
 		return NULL;
@@ -466,7 +471,6 @@ symcomp(pattern, gdict)
 	if (resizestring(&npattern, n - getstringvalue(npattern)) == 0)
 		return npattern;
 	else {
-		DECREF(npattern);
 		return NULL;
 	}
 
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