From bd9de3a31f66bbf38b2e90cc9efb1374cc1314da Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 22 Jan 2023 16:52:39 +0100
Subject: [PATCH] malloc-fail: Fix null deref in xmlAddDefAttrs

Found with libFuzzer, see #344.

Reference:https://github.com/GNOME/libxml2/commit/bd9de3a31f66bbf38b2e90cc9efb1374cc1314da
Conflict:NA
---
 parser.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/parser.c b/parser.c
index fafae15..3c06439 100644
--- a/parser.c
+++ b/parser.c
@@ -1334,6 +1334,8 @@ xmlAddDefAttrs(xmlParserCtxtPtr ctxt,
     /* intern the string and precompute the end */
     len = xmlStrlen(value);
     value = xmlDictLookup(ctxt->dict, value, len);
+    if (value == NULL)
+        goto mem_error;
     defaults->values[5 * defaults->nbAttrs + 2] = value;
     defaults->values[5 * defaults->nbAttrs + 3] = value + len;
     if (ctxt->external)
-- 
2.27.0