diff --git a/NetworkPkg/MnpDxe/MnpConfig.c b/NetworkPkg/MnpDxe/MnpConfig.c
index d0e3f823d279..8811d9e3e449 100644
--- a/NetworkPkg/MnpDxe/MnpConfig.c
+++ b/NetworkPkg/MnpDxe/MnpConfig.c
@@ -1305,6 +1305,10 @@ MnpStop (
   MnpDeviceData = MnpServiceData->MnpDeviceData;
   ASSERT (MnpDeviceData->ConfiguredChildrenNumber > 0);
 
+  if (MnpDeviceData->ConfiguredChildrenNumber <= 0) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
   //
   // Configure the receive filters.
   //
diff --git a/NetworkPkg/MnpDxe/MnpIo.c b/NetworkPkg/MnpDxe/MnpIo.c
index 087c879c46a3..1ac1f2ced2fc 100644
--- a/NetworkPkg/MnpDxe/MnpIo.c
+++ b/NetworkPkg/MnpDxe/MnpIo.c
@@ -325,6 +325,9 @@ MnpInstanceDeliverPacket (
   }
 
   ASSERT (Instance->RcvdPacketQueueSize != 0);
+  if (Instance->RcvdPacketQueueSize <= 0) {
+    return EFI_OUT_OF_RESOURCES;
+  }
 
   RxDataWrap = NET_LIST_HEAD (&Instance->RcvdPacketQueue, MNP_RXDATA_WRAP, WrapEntry);
   if (RxDataWrap->Nbuf->RefCnt > 2) {