NetworkPkg: Replace ASSERT with error handling in Http boot and IScsi

v2:
*Fix some memory leak issue.

This patch is used to replace ASSERT with error handling in Http boot
Driver and IScsi driver.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Reviewed-By: Wu Jiaxin <jiaxin.wu@intel.com>

NetworkPkg/HttpBootDxe/HttpBootConfig.c

@@ -273,7 +273,9 @@ HttpBootFormExtractConfig (
     ConfigRequestHdr = HiiConstructConfigHdr (&gHttpBootConfigGuid, mHttpBootConfigStorageName, CallbackInfo->ChildHandle);
     Size = (StrLen (ConfigRequestHdr) + 32 + 1) * sizeof (CHAR16);
     ConfigRequest = AllocateZeroPool (Size);
-    ASSERT (ConfigRequest != NULL);
+    if (ConfigRequest == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
     AllocatedRequest = TRUE;
     UnicodeSPrint (ConfigRequest, Size, L"%s&OFFSET=0&WIDTH=%016LX", ConfigRequestHdr, (UINT64)BufferSize);
     FreePool (ConfigRequestHdr);
@@ -464,7 +466,6 @@ HttpBootFormCallback (
     // Get user input URI string
     //
     Uri = HiiGetString (CallbackInfo->RegisteredHandle, Value->string, NULL);
-    ASSERT (Uri != NULL);
     if (Uri == NULL) {
       return EFI_UNSUPPORTED;
     }

NetworkPkg/HttpBootDxe/HttpBootDhcp6.c

@@ -401,6 +401,7 @@ HttpBootCacheDhcp6Offer (
   @retval EFI_NOT_READY         Only used in the Dhcp6Selecting state. The EFI DHCPv6 Protocol
                                 driver will continue to wait for more packets.
   @retval EFI_ABORTED           Told the EFI DHCPv6 Protocol driver to abort the current process.
+  @retval EFI_OUT_OF_RESOURCES  There are not enough resources.
 
 **/
 EFI_STATUS
@@ -451,7 +452,9 @@ HttpBootDhcp6CallBack (
        ASSERT (NewPacket != NULL);
        SelectAd   = &Private->OfferBuffer[Private->SelectIndex - 1].Dhcp6.Packet.Offer;
        *NewPacket = AllocateZeroPool (SelectAd->Size);
-       ASSERT (*NewPacket != NULL);
+       if (*NewPacket == NULL) {
+         return EFI_OUT_OF_RESOURCES;
+       }
        CopyMem (*NewPacket, SelectAd, SelectAd->Size);
      }
      break;

NetworkPkg/IScsiDxe/IScsiConfig.c

@@ -1987,7 +1987,11 @@ IScsiFormExtractConfig (
     ConfigRequestHdr = HiiConstructConfigHdr (&gIScsiConfigGuid, mVendorStorageName, Private->DriverHandle);
     Size = (StrLen (ConfigRequestHdr) + 32 + 1) * sizeof (CHAR16);
     ConfigRequest = AllocateZeroPool (Size);
-    ASSERT (ConfigRequest != NULL);
+    if (ConfigRequest == NULL) {
+      FreePool (IfrNvData);
+      FreePool (InitiatorName);
+      return EFI_OUT_OF_RESOURCES;
+    }
     AllocatedRequest = TRUE;
     UnicodeSPrint (ConfigRequest, Size, L"%s&OFFSET=0&WIDTH=%016LX", ConfigRequestHdr, (UINT64)BufferSize);
     FreePool (ConfigRequestHdr);

NetworkPkg/IScsiDxe/IScsiDriver.c

@@ -323,6 +323,7 @@ IScsiSupported (
   @retval EFI_INVALID_PARAMETER Any input parameter is invalid.
   @retval EFI_NOT_FOUND         There is no sufficient information to establish
                                 the iScsi session.
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate memory.
   @retval EFI_DEVICE_ERROR      Failed to get TCP connection device path.
   @retval EFI_ACCESS_DENIED     The protocol could not be removed from the Handle
                                 because its interfaces are being used.

NetworkPkg/IScsiDxe/IScsiMisc.c

@@ -1006,6 +1006,7 @@ IScsiDhcpIsConfigured (
 
   @retval EFI_SUCCESS            The configuration data is retrieved.
   @retval EFI_NOT_FOUND          This iSCSI driver is not configured yet.
+  @retval EFI_OUT_OF_RESOURCES   Failed to allocate memory.
 
 **/
 EFI_STATUS
@@ -1292,7 +1293,9 @@ IScsiGetConfigData (
                                                  mPrivate->PortString,
                                                  NULL
                                                  );
-    ASSERT (AttemptConfigData->AttemptTitleHelpToken != 0);
+    if (AttemptConfigData->AttemptTitleHelpToken == 0) {
+      return EFI_OUT_OF_RESOURCES;
+    }
 
     //
     // Record the attempt in global link list.

NetworkPkg/IScsiDxe/IScsiProto.c

@@ -1,7 +1,7 @@
 /** @file
   The implementation of iSCSI protocol based on RFC3720.
 
-Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2016, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -731,7 +731,10 @@ IScsiPrepareLoginReq (
   }
 
   LoginReq = (ISCSI_LOGIN_REQUEST *) NetbufAllocSpace (Nbuf, sizeof (ISCSI_LOGIN_REQUEST), NET_BUF_TAIL);
-  ASSERT (LoginReq != NULL);
+  if (LoginReq == NULL) {
+    NetbufFree (Nbuf);
+    return NULL;
+  }
   ZeroMem (LoginReq, sizeof (ISCSI_LOGIN_REQUEST));
 
   //
@@ -1245,7 +1248,10 @@ IScsiReceivePdu (
   }
 
   Header = NetbufAllocSpace (PduHdr, Len, NET_BUF_TAIL);
-  ASSERT (Header != NULL);
+  if (Header == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto ON_EXIT;
+  }
   InsertTailList (NbufList, &PduHdr->List);
 
   //
@@ -2316,7 +2322,10 @@ IScsiNewDataOutPdu (
   InsertTailList (NbufList, &PduHdr->List);
 
   DataOutHdr  = (ISCSI_SCSI_DATA_OUT *) NetbufAllocSpace (PduHdr, sizeof (ISCSI_SCSI_DATA_OUT), NET_BUF_TAIL);
-  ASSERT (DataOutHdr != NULL);
+  if (DataOutHdr == NULL) {
+    IScsiFreeNbufList (NbufList);
+    return NULL;
+  }
   XferContext = &Tcb->XferContext;
 
   ZeroMem (DataOutHdr, sizeof (ISCSI_SCSI_DATA_OUT));