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bpo-45507: EOFErrors should be thrown for truncated gzip members (GH-29029)

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Ruben Vorderman 2021-11-19 19:07:05 +01:00 • committed by GitHub
parent 7e44dc0ba7
commit 0ff3d95b98
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Lib/gzip.py
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@ -603,6 +603,9 @@ def decompress(data):
do = zlib.decompressobj(wbits=-zlib.MAX_WBITS)
# Read all the data except the header
decompressed = do.decompress(data[fp.tell():])
if not do.eof or len(do.unused_data) < 8:
raise EOFError("Compressed file ended before the end-of-stream "
"marker was reached")
crc, length = struct.unpack("<II", do.unused_data[:8])
if crc != zlib.crc32(decompressed):
raise BadGzipFile("CRC check failed")