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[3.15] gh-137571: Protect against possible UnboundLocalError in gzip._GzipReader.read() (GH-150222) (GH-150229)

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This has not been observed in practice, but we cannot be 100% sure that
it will not happen with some weird gzip data.
(cherry picked from commit 28eac9a726)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2026-05-22 11:46:14 +02:00 • committed by GitHub
parent b039d1bd97
commit e192a0ea52
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1 changed files with 2 additions and 2 deletions
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Lib/gzip.py
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@ -610,10 +610,10 @@ def read(self, size=-1):
# Read a chunk of data from the file
if self._decompressor.needs_input:
buf = self._fp.read(READ_BUFFER_SIZE)
uncompress = self._decompressor.decompress(buf, size)
else:
uncompress = self._decompressor.decompress(b"", size)
buf = b""
uncompress = self._decompressor.decompress(buf, size)
if self._decompressor.unused_data != b"":
# Prepend the already read bytes to the fileobj so they can
# be seen by _read_eof() and _read_gzip_header()