From 62f199ed7d1c99999030810495bd12fd5b86fee1 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Fri, 17 Mar 2023 12:40:46 +0100
Subject: [PATCH] malloc-fail: Add error check in htmlParseHTMLAttribute

This function must return NULL is an error occurs.

Found by OSS-Fuzz, see #344.

Reference:https://github.com/GNOME/libxml2/commit/62f199ed7d1c99999030810495bd12fd5b86fee1
Conflict:NA

---
 HTMLparser.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/HTMLparser.c b/HTMLparser.c
index 3682807..42d1b29 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -2846,6 +2846,10 @@ htmlParseHTMLAttribute(htmlParserCtxtPtr ctxt, const xmlChar stop) {
 		out = &buffer[indx];
 	    }
 	    c = CUR_CHAR(l);
+            if (ctxt->instate == XML_PARSER_EOF) {
+                xmlFree(buffer);
+                return(NULL);
+            }
 	    if      (c <    0x80)
 		    { *out++  = c;                bits= -6; }
 	    else if (c <   0x800)
-- 
2.27.0