diff -r 7c9327ff5de6 Lib/glob.py
--- a/Lib/glob.py	Sat Dec 15 22:36:49 2012 +0100
+++ b/Lib/glob.py	Sun Dec 16 11:02:46 2012 +0200
@@ -28,7 +28,10 @@
     if not dirname:
         yield from glob1(None, basename)
         return
-    if has_magic(dirname):
+    # `os.path.split()` returns the argument itself as a dirname if it is a
+    # drive or UNC path.  Prevent an infinite recursion if a drive or UNC path
+    # contains magic characters (i.e. r'\\?\C:').
+    if dirname != pathname and has_magic(dirname):
         dirs = iglob(dirname)
     else:
         dirs = [dirname]