1. UsbMassStorage: Increase the timeout of USBFloppyRead10 and USBFloppyWrite10 for data transfer.

2. PxeBc: Fix array out bound error and add code to check the validation of the IP and subnet mask addresses.
3. DxeIpl: Make sure FV HOB is not corrupted by checking FV signature.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2570 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Core/DxeIplPeim/DxeLoad.c

@@ -370,6 +370,11 @@ Returns:
   Hob.Raw = GetHobList ();
   while ((Hob.Raw = GetNextHob (EFI_HOB_TYPE_FV, Hob.Raw)) != NULL) {
     FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) (Hob.FirmwareVolume->BaseAddress);
+    //
+    // Make sure the FV HOB does not get corrupted.
+    //
+    ASSERT (FwVolHeader->Signature == EFI_FVH_SIGNATURE);
+
     Status = PeiServicesFfsFindNextFile (
                Type,
                FwVolHeader,