diff --git a/lucene/core/src/java/org/apache/lucene/codecs/compressing/CompressingStoredFieldsReader.java b/lucene/core/src/java/org/apache/lucene/codecs/compressing/CompressingStoredFieldsReader.java
index 08cf56c034c..f63468ef147 100644
--- a/lucene/core/src/java/org/apache/lucene/codecs/compressing/CompressingStoredFieldsReader.java
+++ b/lucene/core/src/java/org/apache/lucene/codecs/compressing/CompressingStoredFieldsReader.java
@@ -118,12 +118,12 @@ public final class CompressingStoredFieldsReader extends StoredFieldsReader {
       assert CodecUtil.headerLength(codecNameIdx) == indexStream.getFilePointer();
       indexReader = new CompressingStoredFieldsIndexReader(indexStream, si);
 
+      long maxPointer = -1;
+      
       if (version >= VERSION_CHECKSUM) {
         maxPointer = indexStream.readVLong();
-        assert maxPointer + CodecUtil.footerLength() == d.fileLength(fieldsStreamFN);
         CodecUtil.checkFooter(indexStream);
       } else {
-        maxPointer = d.fileLength(fieldsStreamFN);
         CodecUtil.checkEOF(indexStream);
       }
       indexStream.close();
@@ -131,6 +131,14 @@ public final class CompressingStoredFieldsReader extends StoredFieldsReader {
 
       // Open the data file and read metadata
       fieldsStream = d.openInput(fieldsStreamFN, context);
+      if (version >= VERSION_CHECKSUM) {
+        if (maxPointer + CodecUtil.footerLength() != fieldsStream.length()) {
+          throw new CorruptIndexException("Invalid fieldsStream maxPointer (file truncated?): maxPointer=" + maxPointer + ", length=" + fieldsStream.length());
+        }
+      } else {
+        maxPointer = fieldsStream.length();
+      }
+      this.maxPointer = maxPointer;
       final String codecNameDat = formatName + CODEC_SFX_DAT;
       final int fieldsVersion = CodecUtil.checkHeader(fieldsStream, codecNameDat, VERSION_START, VERSION_CURRENT);
       if (version != fieldsVersion) {