From ce2dd0b20bb2d3faff717ab948f7d09bb3749e09 Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Date: Mon, 1 Apr 2024 22:47:38 +0200
Subject: [PATCH] Fix potential NULL pointer argument to memcpy (#13859)

This is only possible when the length is 0, but memcpy doesn't like NULL
pointers, as UBSAN trips over it.
---
 ext/dom/html5_parser.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ext/dom/html5_parser.c b/ext/dom/html5_parser.c
index 68bb9bcc697..97358615507 100644
--- a/ext/dom/html5_parser.c
+++ b/ext/dom/html5_parser.c
@@ -86,7 +86,9 @@ static xmlNodePtr lexbor_libxml2_bridge_new_text_node_fast(xmlDocPtr lxml_doc, c
         lxml_text->type = XML_TEXT_NODE;
         lxml_text->doc = lxml_doc;
         lxml_text->content = BAD_CAST &lxml_text->properties;
-        memcpy(lxml_text->content, data, data_length);
+        if (data != NULL) {
+            memcpy(lxml_text->content, data, data_length);
+        }
         return lxml_text;
     } else {
         return xmlNewDocTextLen(lxml_doc, (const xmlChar *) data, data_length);