mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-07-08 03:45:36 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

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

Browse source 
There was a race condition in base64 in lazy initialization of multiple globals.
This commit is contained in:
Brandon Stansbury 2020-12-31 01:44:46 -08:00 • committed by GitHub
parent f421bfce80
commit 9655434cca
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 5 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Lib/base64.py
View file

@ -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)