From 2a4847a7d1462cdda375429b447e7162514721e0 Mon Sep 17 00:00:00 2001
From: VolodymyrBg <aqdrgg19@gmail.com>
Date: Tue, 25 Nov 2025 04:24:17 +0200
Subject: [PATCH] core/rawdb: fix underflow in freezer inspect for empty
 ancients (#33203)

---
 core/rawdb/ancient_utils.go | 18 ++++++++++++------
 core/rawdb/database.go      |  2 +-
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/core/rawdb/ancient_utils.go b/core/rawdb/ancient_utils.go
index b940d91040..7af3d2e197 100644
--- a/core/rawdb/ancient_utils.go
+++ b/core/rawdb/ancient_utils.go
@@ -34,14 +34,10 @@ type freezerInfo struct {
 	name  string      // The identifier of freezer
 	head  uint64      // The number of last stored item in the freezer
 	tail  uint64      // The number of first stored item in the freezer
+	count uint64      // The number of stored items in the freezer
 	sizes []tableSize // The storage size per table
 }
 
-// count returns the number of stored items in the freezer.
-func (info *freezerInfo) count() uint64 {
-	return info.head - info.tail + 1
-}
-
 // size returns the storage size of the entire freezer.
 func (info *freezerInfo) size() common.StorageSize {
 	var total common.StorageSize
@@ -65,7 +61,11 @@ func inspect(name string, order map[string]freezerTableConfig, reader ethdb.Anci
 	if err != nil {
 		return freezerInfo{}, err
 	}
-	info.head = ancients - 1
+	if ancients > 0 {
+		info.head = ancients - 1
+	} else {
+		info.head = 0
+	}
 
 	// Retrieve the number of first stored item
 	tail, err := reader.Tail()
@@ -73,6 +73,12 @@ func inspect(name string, order map[string]freezerTableConfig, reader ethdb.Anci
 		return freezerInfo{}, err
 	}
 	info.tail = tail
+
+	if ancients == 0 {
+		info.count = 0
+	} else {
+		info.count = info.head - info.tail + 1
+	}
 	return info, nil
 }
 
diff --git a/core/rawdb/database.go b/core/rawdb/database.go
index 131e370650..8260391802 100644
--- a/core/rawdb/database.go
+++ b/core/rawdb/database.go
@@ -644,7 +644,7 @@ func InspectDatabase(db ethdb.Database, keyPrefix, keyStart []byte) error {
 				fmt.Sprintf("Ancient store (%s)", strings.Title(ancient.name)),
 				strings.Title(table.name),
 				table.size.String(),
-				fmt.Sprintf("%d", ancient.count()),
+				fmt.Sprintf("%d", ancient.count),
 			})
 		}
 		total.Add(uint64(ancient.size()))