From 5df07b51ef212c8f57b11b2638de7ae5e4b51877 Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Tue, 17 Mar 2026 19:03:03 +0100
Subject: [PATCH] hashindex: fix memory leak, fixes #9497

Thanks to @rolandrc for finding and fixing this!

Also: set index->buckets = NULL to indicate "we are finished with this" and avoid use-after-free.
---
 src/borg/_hashindex.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/borg/_hashindex.c b/src/borg/_hashindex.c
index afadb23e1..e02bd665a 100644
--- a/src/borg/_hashindex.c
+++ b/src/borg/_hashindex.c
@@ -131,11 +131,13 @@ hashindex_free_buckets(HashIndex *index)
 #ifndef BORG_NO_PYTHON
     if(index->buckets_buffer.buf) {
         PyBuffer_Release(&index->buckets_buffer);
+        index->buckets_buffer.buf = NULL;
     } else
 #endif
     {
         free(index->buckets);
     }
+    index->buckets = NULL;
 }
 
 static int