bpo-39068: Fix race condition in base64 (GH-17627)

There was a race condition in base64 in lazy initialization of multiple globals.

1 files changed, 2 insertions, 2 deletions

diff --git a/Lib/base64.py b/Lib/base64.py
index 539ad16..e1256ad 100755
--- a/Lib/base64.py
+++ b/Lib/base64.py
@@ -344,7 +344,7 @@ def a85encode(b, *, foldspaces=False, wrapcol=0, pad=False, adobe=False):
     global _a85chars, _a85chars2
     # Delay the initialization of tables to not waste memory
     # if the function is never called
-    if _a85chars is None:
+    if _a85chars2 is None:
         _a85chars = [bytes((i,)) for i in range(33, 118)]
         _a85chars2 = [(a + b) for a in _a85chars for b in _a85chars]
 
@@ -452,7 +452,7 @@ def b85encode(b, pad=False):
     global _b85chars, _b85chars2
     # Delay the initialization of tables to not waste memory
     # if the function is never called
-    if _b85chars is None:
+    if _b85chars2 is None:
         _b85chars = [bytes((i,)) for i in _b85alphabet]
         _b85chars2 = [(a + b) for a in _b85chars for b in _b85chars]
     return _85encode(b, _b85chars, _b85chars2, pad)