[PATCH] fix: ensure libdpkg fsys-hash is reset on reuse.

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<div class="deepin-mail-1758607772655-084ce7f76e"><p>libdpkg&nbsp;consuming&nbsp;a&nbsp;large&nbsp;amount&nbsp;of&nbsp;cache&nbsp;memory,&nbsp;so&nbsp;I&nbsp;would<br>&nbsp;&nbsp;&nbsp;&nbsp;release&nbsp;it&nbsp;after&nbsp;use.&nbsp;However,&nbsp;upon&nbsp;re-initializing&nbsp;it&nbsp;for<br>&nbsp;&nbsp;&nbsp;&nbsp;the&nbsp;next&nbsp;use,&nbsp;it&nbsp;would&nbsp;crash.<br><br>&nbsp;&nbsp;&nbsp;&nbsp;when&nbsp;libdpkg&nbsp;is&nbsp;reused,&nbsp;its&nbsp;internal&nbsp;hash&nbsp;table's&nbsp;bin&nbsp;array<br>&nbsp;&nbsp;&nbsp;&nbsp;(fsys_namenode&nbsp;*bins[BINS])&nbsp;was&nbsp;not&nbsp;being&nbsp;properly&nbsp;reset.<br>&nbsp;&nbsp;&nbsp;&nbsp;This&nbsp;caused&nbsp;fsys_hash_find_node&nbsp;to&nbsp;crash&nbsp;by&nbsp;dereferencing<br>&nbsp;&nbsp;&nbsp;&nbsp;stale pointers from a previous operation.</p>
<p>&nbsp;</p>
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<p style="display: inline-block; margin-top: 10px; color: #0000ee;"><span class="sign-click">[email protected]</span></p>
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From 9d0bdcccf579107b1df0dceddc27c64a4a49f204 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E4=BA=9A?= <[email protected]>
Date: Tue, 23 Sep 2025 13:53:09 +0800
Subject: [PATCH] fix: ensure libdpkg fsys-hash is reset on reuse.

    libdpkg consuming a large amount of cache memory, so I would
    release it after use. However, upon re-initializing it for
    the next use, it would crash.

    when libdpkg is reused, its internal hash table's bin array
    (fsys_namenode *bins[BINS]) was not being properly reset.
    This caused fsys_hash_find_node to crash by dereferencing
    stale pointers from a previous operation.
---
 lib/dpkg/dbmodify.c  | 1 +
 lib/dpkg/fsys-hash.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/lib/dpkg/dbmodify.c b/lib/dpkg/dbmodify.c
index 139dc32c4..7de8c6f3b 100644
--- a/lib/dpkg/dbmodify.c
+++ b/lib/dpkg/dbmodify.c
@@ -423,6 +423,7 @@ void modstatdb_shutdown(void) {
   }
 
   pkg_hash_reset();
+  fsys_hash_reset();
 
   modstatdb_done();
 }
diff --git a/lib/dpkg/fsys-hash.c b/lib/dpkg/fsys-hash.c
index 42cb956de..570dd9eb3 100644
--- a/lib/dpkg/fsys-hash.c
+++ b/lib/dpkg/fsys-hash.c
@@ -59,6 +59,9 @@ fsys_hash_init(void)
 void
 fsys_hash_reset(void)
 {
+	if (nfiles == 0)
+		return;
+
 	memset(bins, 0, sizeof(bins));
 	nfiles = 0;
 }
-- 
2.20.1