`zlib.Decompress.flush()` silently returns corrupted output instead of raising `zlib.error`

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#156,173 3 commenti 0 reazioni 1 assegnatario Vedi su GitHub

@StanFromIreland ci sta già lavorando.

Dal 21/8/2026.

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Descrizione

extension-modules type-bug

Bug report

Bug description:

zlib.Decompress.flush() discards errors returned by inflate(), so corrupt data comes back truncated and garbled with no exception, while decompress() reports this correctly.

>>> import zlib
>>> data = zlib.compress(b'abcdefgh' * 200, 9)
>>> corrupt = data[:15] + bytes(60)  # Corrupt the valid stream
>>> d = zlib.decompressobj()
>>> d.decompress(corrupt)  # decompress errors correctly
Traceback (most recent call last):
  File "<python-input-4>", line 1, in <module>
    d.decompress(corrupt)
    ~~~~~~~~~~~~^^^^^^^^^
zlib.error: Error -3 while decompressing data: incorrect data check
>>> d = zlib.decompressobj()
>>> d.decompress(corrupt, 1)  # leaving rest uncomsumed
b'a'
>>> d.flush()  # no flush, corrupted output
b'bcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdeP'
CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs
  • gh-156176
  • gh-156270
  • gh-156271
  • gh-156272
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