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gh-137571: Fix UnboundLocalError in gzip._GzipReader.read() #137572

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gh-137571: Fix UnboundLocalError in gzip._GzipReader.read() #137572

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67db028
`buf` exists iff `self._decompressor.needs_input`
maurycy Aug 8, 2025
572c6d4
Merge branch 'main' into fix-issue-137571
maurycy Aug 11, 2025
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7 changes: 4 additions & 3 deletions Lib/gzip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -575,6 +575,10 @@ 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)
if buf == b"":
raise EOFError("Compressed file ended before the "
"end-of-stream marker was reached")

uncompress = self._decompressor.decompress(buf, size)
else:
uncompress = self._decompressor.decompress(b"", size)
Expand All @@ -586,9 +590,6 @@ def read(self, size=-1):

if uncompress != b"":
break
if buf == b"":
raise EOFError("Compressed file ended before the "
"end-of-stream marker was reached")

self._crc = zlib.crc32(uncompress, self._crc)
self._stream_size += len(uncompress)
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