bpo-39068: Fix race condition in base64 (GH-17627)
There was a race condition in base64 in lazy initialization of multiple globals.
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@ -344,7 +344,7 @@ def a85encode(b, *, foldspaces=False, wrapcol=0, pad=False, adobe=False):
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global _a85chars, _a85chars2
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# Delay the initialization of tables to not waste memory
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# if the function is never called
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if _a85chars is None:
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if _a85chars2 is None:
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_a85chars = [bytes((i,)) for i in range(33, 118)]
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_a85chars2 = [(a + b) for a in _a85chars for b in _a85chars]
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@ -452,7 +452,7 @@ def b85encode(b, pad=False):
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global _b85chars, _b85chars2
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# Delay the initialization of tables to not waste memory
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# if the function is never called
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if _b85chars is None:
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if _b85chars2 is None:
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_b85chars = [bytes((i,)) for i in _b85alphabet]
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_b85chars2 = [(a + b) for a in _b85chars for b in _b85chars]
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return _85encode(b, _b85chars, _b85chars2, pad)
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@ -1659,6 +1659,7 @@ Quentin Stafford-Fraser
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Frank Stajano
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Joel Stanley
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Kyle Stanley
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Brandon Stansbury
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Anthony Starks
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David Steele
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Oliver Steele
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@ -0,0 +1,2 @@
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Fix initialization race condition in :func:`a85encode` and :func:`b85encode`
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in :mod:`base64`. Patch by Brandon Stansbury.
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