https://github.com/python/cpython/commit/28eac9a7263ad8dcfa9b536aa238549131857e0f
commit: 28eac9a7263ad8dcfa9b536aa238549131857e0f
branch: main
author: Serhiy Storchaka <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-05-22T12:17:34+03:00
summary:
gh-137571: Protect against possible UnboundLocalError in
gzip._GzipReader.read() (GH-150222)
This has not been observed in practice, but we cannot be 100% sure that
it will not happen with some weird gzip data.
files:
M Lib/gzip.py
diff --git a/Lib/gzip.py b/Lib/gzip.py
index 8720acc4db9976..0713b922522ee1 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -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()
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