From ac0f5843b5b069e4c3e31425b68ae0bd056ecaed Mon Sep 17 00:00:00 2001
From: Jiaxin Wu <jiaxin.wu@intel.com>
Date: Fri, 17 Jun 2016 14:26:48 +0800
Subject: NetworkPkg: Replace ASSERT with error handling in DnsDxe

v2:
* Use goto to simplify code logic.

This patch is used to replace ASSERT with error handling in
DnsDxe driver.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Zhang Lubo <lubo.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
---
 NetworkPkg/DnsDxe/DnsProtocol.c | 56 ++++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 18 deletions(-)

(limited to 'NetworkPkg/DnsDxe')

diff --git a/NetworkPkg/DnsDxe/DnsProtocol.c b/NetworkPkg/DnsDxe/DnsProtocol.c
index e9101d6644..64fca6a55b 100644
--- a/NetworkPkg/DnsDxe/DnsProtocol.c
+++ b/NetworkPkg/DnsDxe/DnsProtocol.c
@@ -88,8 +88,8 @@ Dns4GetModeData (
     
   Instance = DNS_INSTANCE_FROM_THIS_PROTOCOL4 (This);
   if (Instance->State == DNS_STATE_UNCONFIGED) {
-    gBS->RestoreTPL (OldTpl);
-    return  EFI_NOT_STARTED;
+    Status = EFI_NOT_STARTED;
+    goto ON_EXIT;
   }
   
   ZeroMem (DnsModeData, sizeof (EFI_DNS4_MODE_DATA));
@@ -99,8 +99,7 @@ Dns4GetModeData (
   //
   Status = Dns4CopyConfigure (&DnsModeData->DnsConfigData, &Instance->Dns4CfgData);
   if (EFI_ERROR (Status)) {
-    gBS->RestoreTPL (OldTpl);
-    return Status;
+    goto ON_EXIT;
   }
 
   //
@@ -112,7 +111,12 @@ Dns4GetModeData (
   }
   DnsModeData->DnsServerCount = (UINT32) Index;
   ServerList = AllocatePool (sizeof (EFI_IPv4_ADDRESS) * DnsModeData->DnsServerCount);
-  ASSERT (ServerList != NULL);
+  if (ServerList == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    Dns4CleanConfigure (&DnsModeData->DnsConfigData);
+    goto ON_EXIT;
+  }
+  
   Index = 0;
   NET_LIST_FOR_EACH_SAFE (Entry, Next, &mDriverData->Dns4ServerList) {
     ServerItem = NET_LIST_USER_STRUCT (Entry, DNS4_SERVER_IP, AllServerLink);
@@ -130,7 +134,13 @@ Dns4GetModeData (
   }
   DnsModeData->DnsCacheCount = (UINT32) Index;
   CacheList = AllocatePool (sizeof (EFI_DNS4_CACHE_ENTRY) * DnsModeData->DnsCacheCount);
-  ASSERT (CacheList != NULL);
+  if (CacheList == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    Dns4CleanConfigure (&DnsModeData->DnsConfigData);
+    FreePool (ServerList);
+    goto ON_EXIT;
+  }
+  
   Index =0;
   NET_LIST_FOR_EACH_SAFE (Entry, Next, &mDriverData->Dns4CacheList) {
     CacheItem = NET_LIST_USER_STRUCT (Entry, DNS4_CACHE, AllCacheLink);
@@ -139,9 +149,9 @@ Dns4GetModeData (
   }
   DnsModeData->DnsCacheList = CacheList;
 
+ON_EXIT:
   gBS->RestoreTPL (OldTpl);
-  
-  return EFI_SUCCESS;
+  return Status;
 }
 
 /**
@@ -909,8 +919,8 @@ Dns6GetModeData (
     
   Instance  = DNS_INSTANCE_FROM_THIS_PROTOCOL6 (This);
   if (Instance->State == DNS_STATE_UNCONFIGED) {
-    gBS->RestoreTPL (OldTpl);
-    return  EFI_NOT_STARTED;
+    Status =  EFI_NOT_STARTED;
+    goto ON_EXIT;
   }
 
   ZeroMem (DnsModeData, sizeof (EFI_DNS6_MODE_DATA));
@@ -918,10 +928,9 @@ Dns6GetModeData (
   //
   // Get the current configuration data of this instance. 
   //
-  Status = Dns6CopyConfigure(&DnsModeData->DnsConfigData, &Instance->Dns6CfgData);
+  Status = Dns6CopyConfigure (&DnsModeData->DnsConfigData, &Instance->Dns6CfgData);
   if (EFI_ERROR (Status)) {
-    gBS->RestoreTPL (OldTpl);
-    return Status;
+    goto ON_EXIT;
   }
   
   //
@@ -933,7 +942,12 @@ Dns6GetModeData (
   }
   DnsModeData->DnsServerCount = (UINT32) Index;
   ServerList = AllocatePool (sizeof(EFI_IPv6_ADDRESS) * DnsModeData->DnsServerCount);
-  ASSERT (ServerList != NULL);
+  if (ServerList == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    Dns6CleanConfigure (&DnsModeData->DnsConfigData);
+    goto ON_EXIT;
+  }
+  
   Index = 0;
   NET_LIST_FOR_EACH_SAFE (Entry, Next, &mDriverData->Dns6ServerList) {
     ServerItem = NET_LIST_USER_STRUCT (Entry, DNS6_SERVER_IP, AllServerLink);
@@ -951,7 +965,13 @@ Dns6GetModeData (
   }
   DnsModeData->DnsCacheCount = (UINT32) Index;
   CacheList = AllocatePool (sizeof(EFI_DNS6_CACHE_ENTRY) * DnsModeData->DnsCacheCount);
-  ASSERT (CacheList != NULL);
+  if (CacheList == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    Dns6CleanConfigure (&DnsModeData->DnsConfigData);
+    FreePool (ServerList);
+    goto ON_EXIT;
+  }
+  
   Index =0;
   NET_LIST_FOR_EACH_SAFE (Entry, Next, &mDriverData->Dns6CacheList) {
     CacheItem = NET_LIST_USER_STRUCT (Entry, DNS6_CACHE, AllCacheLink);
@@ -959,10 +979,10 @@ Dns6GetModeData (
     Index++;
   }
   DnsModeData->DnsCacheList = CacheList;
-
-  gBS->RestoreTPL (OldTpl);
   
-  return EFI_SUCCESS;
+ON_EXIT:
+  gBS->RestoreTPL (OldTpl);
+  return Status;
 }
 
 /**
-- 
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