Re: [PATCH] MdeModulePkg SmmLockBox: Return updated Length for EFI_BUFFER_TOO_SMALL

["Yao, Jiewen" <jiewen.yao@intel.com>]

Reviewed-by: Jiewen.yao@intel.com

> -----Original Message-----
> From: Zeng, Star
> Sent: Saturday, February 24, 2018 6:21 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.zeng@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
> Subject: [PATCH] MdeModulePkg SmmLockBox: Return updated Length for
> EFI_BUFFER_TOO_SMALL
> 
> The updated Length value should be returned
> for EFI_BUFFER_TOO_SMALL case.
> 
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Star Zeng <star.zeng@intel.com>
> ---
>  MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.c
> b/MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.c
> index 2dc8815f2eb5..d4183ca4b057 100644
> --- a/MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.c
> +++ b/MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.c
> @@ -9,7 +9,7 @@
>    SmmLockBoxHandler(), SmmLockBoxRestore(), SmmLockBoxUpdate(),
> SmmLockBoxSave()
>    will receive untrusted input and do basic validation.
> 
> -Copyright (c) 2010 - 2017, Intel Corporation. All rights reserved.<BR>
> +Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
> 
>  This program and the accompanying materials
>  are licensed and made available under the terms and conditions
> @@ -217,6 +217,9 @@ SmmLockBoxRestore (
>                 (VOID *)(UINTN)TempLockBoxParameterRestore.Buffer,
>                 (UINTN *)&TempLockBoxParameterRestore.Length
>                 );
> +    if (Status == EFI_BUFFER_TOO_SMALL) {
> +      LockBoxParameterRestore->Length =
> TempLockBoxParameterRestore.Length;
> +    }
>    }
>    LockBoxParameterRestore->Header.ReturnStatus = (UINT64)Status;
>    return ;
> --
> 2.7.0.windows.1