mirror of https://gerrit.osmocom.org/pysim
bertlv_parse_len: Fix input data is smaller than num length octets
This can happen if there's a file with invalid encoding on the card, such as a tag followed by all-ff. Let's gracefully ignore it and return zero bytes as response. Change-Id: Ic44557368a6034dbf4bb021ab23a57927c22def0
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@ -314,6 +314,8 @@ def bertlv_parse_len(binary: bytes) -> Tuple[int, bytes]:
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else:
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num_len_oct = binary[0] & 0x7f
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length = 0
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if len(binary) < num_len_oct + 1:
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return (0, b'')
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for i in range(1, 1+num_len_oct):
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length <<= 8
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length |= binary[i]
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