[Patch] NetworkPkg/HttpBootDxe: Correct the parameter check for the usage of HttpBootGetFileFromCache.

[Jiaxin Wu <jiaxin.wu@intel.com>]

The patch is to fix the incorrect parameter check for the HttpBootGetFileFromCache().

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
---
 NetworkPkg/HttpBootDxe/HttpBootClient.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/NetworkPkg/HttpBootDxe/HttpBootClient.c b/NetworkPkg/HttpBootDxe/HttpBootClient.c
index 15e0ab9d69..b93e63bb2f 100644
--- a/NetworkPkg/HttpBootDxe/HttpBootClient.c
+++ b/NetworkPkg/HttpBootDxe/HttpBootClient.c
@@ -1,9 +1,9 @@
 /** @file
   Implementation of the boot file download function.
 
-Copyright (c) 2015 - 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
 (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
 This program and the accompanying materials are licensed and made available under 
 the terms and conditions of the BSD License that accompanies this distribution.  
 The full text of the license may be found at
 http://opensource.org/licenses/bsd-license.php.                                          
@@ -434,11 +434,11 @@ HttpBootDhcp6ExtractUriInfo (
       goto Error;
     }
   }
   
   //
-  // Extract the HTTP server Ip frome URL. This is used to Check route table 
+  // Extract the HTTP server Ip from URL. This is used to Check route table 
   // whether can send message to HTTP Server Ip through the GateWay.
   //
   Status = HttpUrlGetIp6 (
              Private->BootFileUri,
              Private->BootFileUriParser,
@@ -744,23 +744,22 @@ HttpBootGetFileFromCache (
   LIST_ENTRY                  *Entry2;
   HTTP_BOOT_CACHE_CONTENT     *Cache;
   HTTP_BOOT_ENTITY_DATA       *EntityData;
   UINTN                       CopyedSize;
   
-  if (Uri == NULL || BufferSize == 0 || Buffer == NULL || ImageType == NULL) {
+  if (Uri == NULL || BufferSize == NULL || Buffer == NULL || ImageType == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
   NET_LIST_FOR_EACH (Entry, &Private->CacheList) {
     Cache = NET_LIST_USER_STRUCT (Entry, HTTP_BOOT_CACHE_CONTENT, Link);
     //
     // Compare the URI to see whether we already have a cache for this file.
     //
     if ((Cache->RequestData != NULL) &&
         (Cache->RequestData->Url != NULL) &&
-        (StrCmp (Uri, Cache->RequestData->Url) == 0)) 
-    {
+        (StrCmp (Uri, Cache->RequestData->Url) == 0)) {
       //
       // Hit in cache, record image type.
       //
       *ImageType  = Cache->ImageType;
 
@@ -945,11 +944,11 @@ HttpBootGetBootFile (
   Url = AllocatePool (UrlSize * sizeof (CHAR16));
   if (Url == NULL) {
     return EFI_OUT_OF_RESOURCES;
   }
   AsciiStrToUnicodeStrS (Private->BootFileUri, Url, UrlSize);
-  if (!HeaderOnly) {
+  if (!HeaderOnly && Buffer != NULL) {
     Status = HttpBootGetFileFromCache (Private, Url, BufferSize, Buffer, ImageType);
     if (Status != EFI_NOT_FOUND) {
       FreePool (Url);
       return Status;
     }
@@ -1127,11 +1126,11 @@ HttpBootGetBootFile (
   Context.Buffer     = Buffer;
   Context.BufferSize = *BufferSize;
   Context.Cache      = Cache;
   Context.Private    = Private;
   Status = HttpInitMsgParser (
-             HeaderOnly? HttpMethodHead : HttpMethodGet,
+             HeaderOnly ? HttpMethodHead : HttpMethodGet,
              ResponseData->Response.StatusCode,
              ResponseData->HeaderCount,
              ResponseData->Headers,
              HttpBootGetBootFileCallback,
              (VOID*) &Context,
-- 
2.16.2.windows.1