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The assumption in asn1_type() that an ASN.1 cursor will always contain a type byte is incorrect. A cursor that has been cleanly invalidated via asn1_invalidate_cursor() will contain a type byte, but there are other ways in which to arrive at a zero-length cursor. Fix by explicitly checking the cursor length in asn1_type(). This allows asn1_invalidate_cursor() to be reduced to simply zeroing the length field. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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