From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Mon, 19 Aug 2024 22:26:07 +0200
Subject: [PATCH] lib: Reject negative len for XML_ParseBuffer

CVE-2024-45490

Reported by TaiYou

Change-Id: Ic070b629e085c2aa5fd2711e1738acde42fee444
---
 lib/xmlparse.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/xmlparse.c b/lib/xmlparse.c
index d3b43171..d9f33395 100644
--- a/lib/xmlparse.c
+++ b/lib/xmlparse.c
@@ -1672,6 +1672,12 @@ XML_ParseBuffer(XML_Parser parser, int len, int isFinal)
 
   if (parser == NULL)
     return XML_STATUS_ERROR;
+
+  if (len < 0) {
+    errorCode = XML_ERROR_INVALID_ARGUMENT;
+    return XML_STATUS_ERROR;
+  }
+
   switch (ps_parsing) {
   case XML_SUSPENDED:
     errorCode = XML_ERROR_SUSPENDED;