Re: [PATCH 2/2] MdePkg/DevicePathFromText: Fix byte orders when handling 8-byte array

["Gao, Liming" <liming.gao@intel.com>]

Reviewed-by: Liming Gao <liming.gao@intel.com>

> -----Original Message-----
> From: Ni, Ruiyu
> Sent: Friday, March 2, 2018 7:52 PM
> To: edk2-devel@lists.01.org
> Cc: Lin, Jie <jie.lin@intel.com>; Gao, Liming <liming.gao@intel.com>; Zhu, Yonghong <yonghong.zhu@intel.com>
> Subject: [PATCH 2/2] MdePkg/DevicePathFromText: Fix byte orders when handling 8-byte array
> 
> Per UEFI spec, FibreEx.WWN, FibreEx.Lun, SasEx.Address, SasEx.Lun
> and iSCSI.Lun are all 8-byte array with byte #0 in the left.
> It means "0102030405060708" should be converted to:
>     UINT8[8] = {01, 02, 03, 04, 05, 06, 07, 08}
> or  UINT64 = {0807060504030201}
> 
> Today's implementation wrongly uses the reversed order.
> The patch fixes this issue by using StrHexToBytes().
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
> Cc: Jie Lin <jie.lin@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Cc: Yonghong Zhu <yonghong.zhu@intel.com>
> ---
>  .../Library/UefiDevicePathLib/DevicePathFromText.c | 32 ++++++++++++++--------
>  1 file changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c b/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c
> index c66b77ba6c..63cbc9449b 100644
> --- a/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c
> +++ b/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c
> @@ -1140,11 +1140,14 @@ DevPathFromTextFibreEx (
>                                               );
> 
>    FibreEx->Reserved = 0;
> -  Strtoi64 (WWNStr, (UINT64 *) (&FibreEx->WWN));
> -  Strtoi64 (LunStr, (UINT64 *) (&FibreEx->Lun));
> -
> -  *(UINT64 *) (&FibreEx->WWN) = SwapBytes64 (*(UINT64 *) (&FibreEx->WWN));
> -  *(UINT64 *) (&FibreEx->Lun) = SwapBytes64 (*(UINT64 *) (&FibreEx->Lun));
> +  StrHexToBytes (
> +    WWNStr, sizeof (FibreEx->WWN) * 2,
> +    FibreEx->WWN, sizeof (FibreEx->WWN)
> +    );
> +  StrHexToBytes (
> +    LunStr, sizeof (FibreEx->Lun) * 2,
> +    FibreEx->Lun, sizeof (FibreEx->Lun)
> +    );
> 
>    return (EFI_DEVICE_PATH_PROTOCOL *) FibreEx;
>  }
> @@ -1546,8 +1549,6 @@ DevPathFromTextSasEx (
>    CHAR16            *DriveBayStr;
>    UINT16            Info;
>    UINT16            Uint16;
> -  UINT64            SasAddress;
> -  UINT64            Lun;
>    SASEX_DEVICE_PATH *SasEx;
> 
>    AddressStr  = GetNextParamStr (&TextDeviceNode);
> @@ -1563,10 +1564,14 @@ DevPathFromTextSasEx (
>                                          (UINT16) sizeof (SASEX_DEVICE_PATH)
>                                          );
> 
> -  Strtoi64 (AddressStr, &SasAddress);
> -  Strtoi64 (LunStr,     &Lun);
> -  WriteUnaligned64 ((UINT64 *) &SasEx->SasAddress, SwapBytes64 (SasAddress));
> -  WriteUnaligned64 ((UINT64 *) &SasEx->Lun,        SwapBytes64 (Lun));
> +  StrHexToBytes (
> +    AddressStr, sizeof (SasEx->SasAddress) * 2,
> +    SasEx->SasAddress, sizeof (SasEx->SasAddress)
> +    );
> +  StrHexToBytes (
> +    LunStr, sizeof (SasEx->Lun) * 2,
> +    SasEx->Lun, sizeof (SasEx->Lun)
> +    );
>    SasEx->RelativeTargetPort      = (UINT16) Strtoi (RTPStr);
> 
>    if (StrCmp (SASSATAStr, L"NoTopology") == 0) {
> @@ -2560,7 +2565,10 @@ DevPathFromTextiSCSI (
>    StrToAscii (NameStr, &AsciiStr);
> 
>    ISCSIDevPath->TargetPortalGroupTag = (UINT16) Strtoi (PortalGroupStr);
> -  Strtoi64 (LunStr, &ISCSIDevPath->Lun);
> +  StrHexToBytes (
> +    LunStr, sizeof (ISCSIDevPath->Lun) * 2,
> +    (UINT8 *)&ISCSIDevPath->Lun, sizeof (ISCSIDevPath->Lun)
> +    );
> 
>    Options = 0x0000;
>    if (StrCmp (HeaderDigestStr, L"CRC32C") == 0) {
> --
> 2.16.1.windows.1