Index: p7zip_15.14.1/CPP/7zip/Archive/Udf/UdfIn.cpp
===================================================================
--- p7zip_15.14.1.orig/CPP/7zip/Archive/Udf/UdfIn.cpp
+++ p7zip_15.14.1/CPP/7zip/Archive/Udf/UdfIn.cpp
@@ -389,7 +389,11 @@ HRESULT CInArchive::ReadFileItem(int vol
     return S_FALSE;
   CFile &file = Files.Back();
   const CLogVol &vol = LogVols[volIndex];
-  CPartition &partition = Partitions[vol.PartitionMaps[lad.Location.PartitionRef].PartitionIndex];
+  unsigned partitionRef = lad.Location.PartitionRef;
+
+  if (partitionRef >= vol.PartitionMaps.Size())
+  	return S_FALSE;
+  CPartition &partition = Partitions[vol.PartitionMaps[partitionRef].PartitionIndex];
 
   UInt32 key = lad.Location.Pos;
   UInt32 value;