Re: [PATCH] MdeModulePkg/DxeCapsuleLibFmp: Add more check for the UX capsule

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

Reviewed-by: jiewen.yao@intel.com

> -----Original Message-----
> From: Ni, Ruiyu
> Sent: Friday, March 16, 2018 3:06 PM
> To: edk2-devel@lists.01.org
> Cc: Yao, Jiewen <jiewen.yao@intel.com>
> Subject: [PATCH] MdeModulePkg/DxeCapsuleLibFmp: Add more check for the
> UX capsule
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> ---
>  .../Library/DxeCapsuleLibFmp/DxeCapsuleLib.c        | 21
> +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> b/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> index 15dbc00216..555c5971d0 100644
> --- a/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> +++ b/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> @@ -330,8 +330,25 @@ DisplayCapsuleImage (
>    UINTN                         Width;
>    EFI_GRAPHICS_OUTPUT_PROTOCOL  *GraphicsOutput;
> 
> -  ImagePayload = (DISPLAY_DISPLAY_PAYLOAD *)(CapsuleHeader + 1);
> -  PayloadSize = CapsuleHeader->CapsuleImageSize -
> sizeof(EFI_CAPSULE_HEADER);
> +  //
> +  // UX capsule doesn't have extended header entries.
> +  //
> +  if (CapsuleHeader->HeaderSize != sizeof (EFI_CAPSULE_HEADER)) {
> +    return EFI_UNSUPPORTED;
> +  }
> +  ImagePayload = (DISPLAY_DISPLAY_PAYLOAD *)((UINTN) CapsuleHeader +
> CapsuleHeader->HeaderSize);
> +  //
> +  // (CapsuleImageSize > HeaderSize) is guaranteed by IsValidCapsuleHeader().
> +  //
> +  PayloadSize = CapsuleHeader->CapsuleImageSize -
> CapsuleHeader->HeaderSize;
> +
> +  //
> +  // Make sure the image payload at least contain the
> DISPLAY_DISPLAY_PAYLOAD header.
> +  // Further size check is performed by the logic translating BMP to GOP BLT.
> +  //
> +  if (PayloadSize <= sizeof (DISPLAY_DISPLAY_PAYLOAD)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> 
>    if (ImagePayload->Version != 1) {
>      return EFI_UNSUPPORTED;
> --
> 2.16.1.windows.1