From 73ce5600f1954c751fc9e59ca5666d996b7b9420 Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sun, 7 Jun 2026 11:53:54 +0000
Subject: object/tree: Reject duplicates

---
 object/tree/parse.go | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'object')

diff --git a/object/tree/parse.go b/object/tree/parse.go
index b1069918..90519705 100644
--- a/object/tree/parse.go
+++ b/object/tree/parse.go
@@ -17,6 +17,7 @@ import (
 func Parse(body []byte, objectFormat id.ObjectFormat) (*Tree, error) {
 	tree := new(Tree)
 	idSize := objectFormat.Size()
+	seen := make(map[string]struct{})
 
 	i := 0
 	for i < len(body) {
@@ -65,6 +66,12 @@ func Parse(body []byte, objectFormat id.ObjectFormat) (*Tree, error) {
 			}
 		}
 
+		if _, dup := seen[entry.Name]; dup {
+			return nil, fmt.Errorf("%w: duplicate entry name %q", ErrInvalidTree, entry.Name)
+		}
+
+		seen[entry.Name] = struct{}{}
+
 		tree.entries = append(tree.entries, entry)
 	}
 
-- 
cgit v1.3.1-10-gc9f91