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efi_loader: GetNextMonotonicCount() check parameter

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Do not write to address indicated by NULL pointer.

UEFI SCT II 2.6 (2017), 3.6.5 GetNextMonotonicCount(), 5.1.5.5.1

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-05-17 12:47:17 +02:00
parent db80fe3866
commit 1344f7d0f6
1 changed files with 8 additions and 1 deletions
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9
lib/efi_loader/efi_boottime.c
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@ -1916,10 +1916,17 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
{
static uint64_t mono;
efi_status_t ret;
EFI_ENTRY("%p", count);
if (!count) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
*count = mono++;
return EFI_EXIT(EFI_SUCCESS);
ret = EFI_SUCCESS;
out:
return EFI_EXIT(ret);
}
/**