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#15546: Fix GzipFile.peek()'s handling of pathological input data.

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This is a backport of changeset 8c07ff7f882f.
This commit is contained in:
Serhiy Storchaka 2013-01-22 15:54:48 +02:00
parent f186911e24
commit fc6e8aabf5
2 changed files with 7 additions and 2 deletions
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6
Lib/gzip.py
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@ -367,8 +367,10 @@ class GzipFile(io.BufferedIOBase):
if self.fileobj is None:
return b''
try:
# 1024 is the same buffering heuristic used in read()
self._read(max(n, 1024))
# Ensure that we don't return b"" if we haven't reached EOF.
while self.extrasize == 0:
# 1024 is the same buffering heuristic used in read()
self._read(max(n, 1024))
except EOFError:
pass
offset = self.offset - self.extrastart