From 7ddd42a57a2d63704f7caf30293fb6df9e4acfe3 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 26 Jun 2005 21:59:34 +0000
Subject: [PATCH] Backport: Prevent creating a HTML link to file://?/

---
 Lib/cgitb.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Lib/cgitb.py b/Lib/cgitb.py
index db46b25d60b5..a52800afef55 100644
--- a/Lib/cgitb.py
+++ b/Lib/cgitb.py
@@ -112,8 +112,11 @@ function calls leading up to the error, in the order they occurred.</p>'''
     frames = []
     records = inspect.getinnerframes(etb, context)
     for frame, file, lnum, func, lines, index in records:
-        file = file and os.path.abspath(file) or '?'
-        link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))
+        if file:
+            file = os.path.abspath(file)
+            link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))
+        else:
+            file = link = '?'
         args, varargs, varkw, locals = inspect.getargvalues(frame)
         call = ''
         if func != '?':
-- 
2.47.3