From 7ec314efcd8b3df1d05d793812e54656bf539af8 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Mon, 30 Jan 2023 15:59:55 +0100
Subject: [PATCH] malloc-fail: Add error checks in xmlXPathEqualValuesCommon

Avoid null deref.

Found with libFuzzer, see #344.

Reference:https://github.com/GNOME/libxml2/commit/7ec314efcd8b3df1d05d793812e54656bf539af8
Conflict:NA
---
 xpath.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xpath.c b/xpath.c
index fbec21b..6d76e43 100644
--- a/xpath.c
+++ b/xpath.c
@@ -7011,6 +7011,7 @@ xmlXPathEqualValuesCommon(xmlXPathParserContextPtr ctxt,
 		    valuePush(ctxt, arg2);
 		    xmlXPathNumberFunction(ctxt, 1);
 		    arg2 = valuePop(ctxt);
+                    CHECK_ERROR0;
                     /* Falls through. */
 		case XPATH_NUMBER:
 		    /* Hand check NaN and Infinity equalities */
@@ -7074,6 +7075,7 @@ xmlXPathEqualValuesCommon(xmlXPathParserContextPtr ctxt,
 		    valuePush(ctxt, arg1);
 		    xmlXPathNumberFunction(ctxt, 1);
 		    arg1 = valuePop(ctxt);
+                    CHECK_ERROR0;
 		    /* Hand check NaN and Infinity equalities */
 		    if (xmlXPathIsNaN(arg1->floatval) ||
 			    xmlXPathIsNaN(arg2->floatval)) {
-- 
2.27.0

