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gh-141141: Make base64.b85decode() thread safe (GH-141149)

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Benel Tayar 2025-11-07 12:47:25 +02:00 • committed by GitHub
parent 9a19900673
commit a7bf27f7f5
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2 changed files with 6 additions and 2 deletions
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7
Lib/base64.py
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@ -462,9 +462,12 @@ def b85decode(b):
# Delay the initialization of tables to not waste memory # Delay the initialization of tables to not waste memory
# if the function is never called # if the function is never called
if _b85dec is None: if _b85dec is None:
_b85dec = [None] * 256 # we don't assign to _b85dec directly to avoid issues when
# multiple threads call this function simultaneously
b85dec_tmp = [None] * 256
for i, c in enumerate(_b85alphabet): for i, c in enumerate(_b85alphabet):
_b85dec[c] = i b85dec_tmp[c] = i
_b85dec = b85dec_tmp
b = _bytes_from_decode_data(b) b = _bytes_from_decode_data(b)
padding = (-len(b)) % 5 padding = (-len(b)) % 5

1
Misc/NEWS.d/next/Library/2025-11-06-15-11-50.gh-issue-141141.tgIfgH.rst Normal file
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@ -0,0 +1 @@
Fix a thread safety issue with :func:`base64.b85decode`. Contributed by Benel Tayar.