BmFindBootOptionInVariable() does not check if input pointer is NULL

[makubacki]

From MdeModulePkg\Library\UefiBootManagerLib\BmBoot.c

UINTN
BmFindBootOptionInVariable (
  IN  EFI_BOOT_MANAGER_LOAD_OPTION  *OptionToFind
  )
{
  EFI_STATUS                    Status;
  EFI_BOOT_MANAGER_LOAD_OPTION  BootOption;
  UINTN                         OptionNumber;
  CHAR16                        OptionName[BM_OPTION_NAME_LEN];
  EFI_BOOT_MANAGER_LOAD_OPTION  *BootOptions;
  UINTN                         BootOptionCount;
  UINTN                         Index;

  OptionNumber = LoadOptionNumberUnassigned;

  //
  // Try to match the variable exactly if the option number is assigned
  //
  if (OptionToFind->OptionNumber != LoadOptionNumberUnassigned) {
    UnicodeSPrint (
      OptionName,
      sizeof (OptionName),
      L"%s%04x",
      mBmLoadOptionName[OptionToFind->OptionType],
      OptionToFind->OptionNumber
      );

OptionToFind should be checked for being NULL before being dereferenced in the function.

Found in #182

[makubacki]

Fixed in referenced merged PRs