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;
16'>refs</a><a class='active' href='/guix/log/tests/git.scm'>log</a><a href='/guix/tree/tests/git.scm?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>tree</a><a href='/guix/commit/tests/git.scm?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>commit</a><a href='/guix/diff/tests/git.scm?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/git.scm'>
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<div class='path'>path: <a href='/guix/log/?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>root</a>/<a href='/guix/log/tests?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>tests</a>/<a href='/guix/log/tests/git.scm?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>git.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/tests/git.scm?id=8851c55b538f62534f16c1dd1e22657ef2f3c916&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-07-18 17:31:19 +0200'>2024-07-18</span></td><td><a href='/guix/commit/tests/git.scm?id=58e268c2e30567f415fa4e02086e49299c31406a'>git: Remove untracked files from cached checkouts.</a><span class='msg-avail'>...<span class='msg-tooltip'>Cached checkouts could end up with stale untracked files, for example
because the checkout was interrupted.  As a result, when this happens
for the Guix checkout, users would not get substitutes for ‘guix pull’.

* guix/git.scm (delete-untracked-files): New procedure.
(switch-to-ref): Use it.
* tests/git.scm ("update-cached-checkout, untracked files removed"): New
test.

Co-authored-by: Ricardo Wurmus &lt;rekado@elephly.net&gt;
Change-Id: Iccbe644ade396ad27a037db7e0ef1c2a68ef91ce
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-26 17:36:59 +0200'>2023-09-26</span></td><td><a href='/guix/commit/tests/git.scm?id=ba21eeb565fe414b3647173068a0f3eadd174c06'>tests: Assume ‘git’ is always available.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/channels.scm (gpg+git-available?): Check for ‘gpg-command’
only.
Remove all ‘test-skip’ statements.
* tests/derivations.scm: Likewise.
* tests/git-authenticate.scm: Likewise.
* tests/git.scm: Likewise.
* tests/import-git.scm: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>