Patched code sample

import zlib
import io

try:
    from thrift.transport.TTransport import TTransportException
except ImportError:
    # Mock exception if thrift is not installed
    class TTransportException(Exception):
        INVALID_DATA = 2
        def __init__(self, type=None, message=None):
            super().__init__(message)

# The fix introduces a configurable limit on the uncompressed data size.
MAX_UNCOMPRESSED_SIZE_BYTES = 100 * 1024 * 1024  # 100 MB

def read_zlib_frame(transport: io.BytesIO):
    """
    Reads a compressed frame from the transport and returns the decompressed data.
    This function is analogous to a method in TZlibTransport.
    """
    # In a real scenario, a frame length would be read first.
    # This is simplified to focus on the decompression call.
    compressed_frame = transport.read()
    if not compressed_frame:
        return b""

    try:
        # FIX: The 'bufsize' parameter limits the size of the output buffer.
        # If the decompressed data would exceed this, zlib.error is raised,
        # preventing excessive memory allocation (zip bomb).
        uncompressed_data = zlib.decompress(
            compressed_frame, bufsize=MAX_UNCOMPRESSED_SIZE_BYTES
        )
        return uncompressed_data
    except zlib.error as e:
        raise TTransportException(
            type=TTransportException.INVALID_DATA,
            message=f"Could not decompress data: {e}",
        )