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An attempt to use a validator for an empty certificate chain will correctly fail the overall validation with the "empty certificate chain" error propagated from x509_auto_append(). In a debug build, the call to validator_name() will attempt to call x509_name() on a non-existent certificate, resulting in garbage in the debug message. Fix by checking for the special case of an empty certificate chain. This issue does not affect non-debug builds, since validator_name() is (as per its description) called only for debug messages. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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