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The DxeTpmMeasureBootHandler and DxeTpm2MeasureBootHandler handlers are SECURITY2_FILE_AUTHENTICATION_HANDLER prototype. This prototype can not return EFI_INVALID_PARAMETER. The prototype documentation states it returns EFI_ACCESS_DENIED if: "The file specified by File and FileBuffer did not authenticate, and the platform policy dictates that the DXE Foundation may not use File." Correct the documentation, and add a early check, returning EFI_ACCESS_DENIED when File is NULL. Noticed while reviewing commit 6d57592740cdd0b6868baeef7929d6e6fef. Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Chao Zhang <chao.b.zhang@intel.com> Signed-off-by: Philippe Mathieu-Daude <philmd@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com>