xref: /third_party/libxml2/backport-xpath-Ignore-entity-ref-nodes-when-computing-node-ha.patch

From 6273df6c6d84b6be8a62a62abf1d9b79cc2035f8 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 30 May 2023 12:30:27 +0200
Subject: [PATCH] xpath: Ignore entity ref nodes when computing node hash

XPath queries only work reliably if entities are substituted.
Nevertheless, it's possible to query a document with entity reference
nodes. xmllint even deletes entities when the `--dropdtd` option is
passed, resulting in dangling pointers, so it's best to skip entity
reference nodes to avoid a use-after-free.

Fixes #550.

Reference:https://github.com/GNOME/libxml2/commit/6273df6c6d84b6be8a62a62abf1d9b79cc2035f8
Conflict:NA

---
 xpath.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/xpath.c b/xpath.c
index 3d1ca71..3128efb 100644
--- a/xpath.c
+++ b/xpath.c
@@ -6396,11 +6396,12 @@ xmlXPathNodeValHash(xmlNodePtr node) {
 	/*
 	 * Skip to next node
 	 */
-	if ((tmp->children != NULL) && (tmp->type != XML_DTD_NODE)) {
-	    if (tmp->children->type != XML_ENTITY_DECL) {
-		tmp = tmp->children;
-		continue;
-	    }
+        if ((tmp->children != NULL) &&
+            (tmp->type != XML_DTD_NODE) &&
+            (tmp->type != XML_ENTITY_REF_NODE) &&
+            (tmp->children->type != XML_ENTITY_DECL)) {
+            tmp = tmp->children;
+            continue;
 	}
 	if (tmp == node)
 	    break;
-- 
2.27.0