MdeModulePkg CapsuleApp: Check capsule header for -D and -N options

Then meaningful error message can be shown when the input image is
unexpected.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

MdeModulePkg/Application/CapsuleApp/CapsuleDump.c

@@ -61,6 +61,24 @@ WriteFileFromBuffer (
   IN  VOID                                 *Buffer
   );
 
+/**
+  Validate if it is valid capsule header
+
+  This function assumes the caller provided correct CapsuleHeader pointer
+  and CapsuleSize.
+
+  This function validates the fields in EFI_CAPSULE_HEADER.
+
+  @param[in] CapsuleHeader  Points to a capsule header.
+  @param[in] CapsuleSize    Size of the whole capsule image.
+
+**/
+BOOLEAN
+IsValidCapsuleHeader (
+  IN EFI_CAPSULE_HEADER     *CapsuleHeader,
+  IN UINT64                 CapsuleSize
+  );
+
 /**
   Dump UX capsule information.
 
@@ -248,6 +266,11 @@ DumpCapsule (
     Print(L"CapsuleApp: Capsule (%s) is not found.\n", CapsuleName);
     goto Done;
   }
+  if (!IsValidCapsuleHeader (Buffer, FileSize)) {
+    Print(L"CapsuleApp: Capsule image (%s) is not a valid capsule.\n", CapsuleName);
+    Status = EFI_INVALID_PARAMETER;
+    goto Done;
+  }
 
   CapsuleHeader = Buffer;
   if (CompareGuid(&CapsuleHeader->CapsuleGuid, &gWindowsUxCapsuleGuid)) {