https://github.com/libexpat/libexpat/commit/9bf0f2c16ee86f644dd1432507edff94c08dc232.patch
Fixed in 2.6.3.

From 9bf0f2c16ee86f644dd1432507edff94c08dc232 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Mon, 19 Aug 2024 22:37:16 +0200
Subject: [PATCH] lib: Detect integer overflow in function nextScaffoldPart

Reported by TaiYou
---
 expat/lib/xmlparse.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/xmlparse.c b/lib/xmlparse.c
index 91682c188..f737575ea 100644
--- a/lib/xmlparse.c
+++ b/lib/xmlparse.c
@@ -7558,6 +7558,15 @@ nextScaffoldPart(XML_Parser parser) {
   int next;
 
   if (! dtd->scaffIndex) {
+    /* Detect and prevent integer overflow.
+     * The preprocessor guard addresses the "always false" warning
+     * from -Wtype-limits on platforms where
+     * sizeof(unsigned int) < sizeof(size_t), e.g. on x86_64. */
+#if UINT_MAX >= SIZE_MAX
+    if (parser->m_groupSize > ((size_t)(-1) / sizeof(int))) {
+      return -1;
+    }
+#endif
     dtd->scaffIndex = (int *)MALLOC(parser, parser->m_groupSize * sizeof(int));
     if (! dtd->scaffIndex)
       return -1;
9bb5d28832b6538aa7a2'>refs</a><a class='active' href='/guix/log/gnu/services/avahi.scm'>log</a><a href='/guix/tree/gnu/services/avahi.scm?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>tree</a><a href='/guix/commit/gnu/services/avahi.scm?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>commit</a><a href='/guix/diff/gnu/services/avahi.scm?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/avahi.scm'>
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<div class='path'>path: <a href='/guix/log/?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>root</a>/<a href='/guix/log/gnu?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>gnu</a>/<a href='/guix/log/gnu/services?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>services</a>/<a href='/guix/log/gnu/services/avahi.scm?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2'>avahi.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/avahi.scm?id=ceb9c6c50ed2c0d127189bb5d28832b6538aa7a2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-11-30 01:08:55 +0100'>2021-11-30</span></td><td><a href='/guix/commit/gnu/services/avahi.scm?id=892f1b7273d57b25940700877a02618fe826cc08'>services: Accept &lt;inferior-package&gt;s in lieu of &lt;package&gt;s.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/authentication.scm (fprintd-configuration)
(nslcd-configuration): Substitute file-like objects for package ones.
* gnu/services/cgit.scm (cgit-configuration, opaque-cgit-configuration):
Likewise.
* gnu/services/cups.scm (package-list?, cups-configuration): Likewise.
* gnu/services/dns.scm (verify-knot-configuration)
(ddclient-configuration): Likewise.
* gnu/services/docker.scm (docker-configuration): Likewise.
* gnu/services/file-sharing.scm (transmission-daemon-configuration): Likewise.
* gnu/services/getmail.scm (getmail-configuration): Likewise.
* gnu/services/mail.scm (dovecot-configuration)
(opaque-dovecot-configuration): Likewise.
* gnu/services/messaging.scm (prosody-configuration)
(opaque-prosody-configuration): Likewise.
* gnu/services/monitoring.scm (zabbix-server-configuration)
(zabbix-agent-configuration): Likewise.
* gnu/services/networking.scm (opendht-configuration): Likewise.
* gnu/services/pm.scm (tlp-configuration): Likewise.
* gnu/services/telephony.scm (jami-configuration): Likewise.
* gnu/services/virtualization.scm (libvirt-configuration)
(qemu-guest-agent-configuration): Likewise.
* gnu/services/vpn.scm (openvpn-client-configuration): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-06-14 18:35:17 +0200'>2021-06-14</span></td><td><a href='/guix/commit/gnu/services/avahi.scm?id=f70c3429ed0064eb4554722b4a60031385fd6785'>services: Remove deprecated service procedures.</a><span class='msg-avail'>...<span class='msg-tooltip'>These service procedures were deprecated in January 2019, for instance
in commit 65a67bf711b14bc7200f6730c0f173375ca12974.

* gnu/services/avahi.scm (avahi-service): Remove.
* gnu/services/base.scm (console-keymap, guix-service)
(guix-publish-service, gpm-service, urandom-seed-service): Remove.
* gnu/services/desktop.scm (upower-service, colord-service): Remove.
* gnu/services/mcron.scm (mcron-service): Remove.
* gnu/services/messaging.scm (bitlbee-service): Remove.
* gnu/services/networking.scm (dhcp-client-service, ntp-service)
(tor-service): Remove.
* gnu/services/xorg.scm (slim-service, gdm-service): Remove.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-09 14:13:32 +0100'>2020-12-09</span></td><td><a href='/guix/commit/gnu/services/avahi.scm?id=59a6780f70e138a515dfe9c3b5b5399dbd91c228'>services: avahi: Depend on 'user-processes'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/avahi.scm (avahi-shepherd-service): Add 'user-processes'
to 'requirement'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-19 06:09:01 +0100'>2020-01-19</span></td><td><a href='/guix/commit/gnu/services/avahi.scm?id=f460f8da68f915dee5aa3ce97e05ba38c92f3106'>gnu: Use HTTPS for avahi.org everywhere.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/avahi.scm (avahi)[home-page]: Use HTTPS.
* gnu/services/avahi.scm (avahi-service): Likewise in docstring.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>