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From 1fbcf4098ba2aefe241de8d7ceb229b995d8daec Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Mon, 23 Sep 2019 17:13:05 +0200
Subject: [PATCH 3/3] Make xmlTextReaderFreeNodeList non-recursive
Avoid call stack overflow when freeing deeply nested documents.
Found by OSS-Fuzz.
---
xmlreader.c | 32 +++++++++++++++++++++++---------
1 file changed, 23 insertions(+), 9 deletions(-)
diff --git a/xmlreader.c b/xmlreader.c
index d715071..9229c18 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -348,7 +348,9 @@ xmlTextReaderFreePropList(xmlTextReaderPtr reader, xmlAttrPtr cur) {
static void
xmlTextReaderFreeNodeList(xmlTextReaderPtr reader, xmlNodePtr cur) {
xmlNodePtr next;
+ xmlNodePtr parent;
xmlDictPtr dict;
+ size_t depth = 0;
if ((reader != NULL) && (reader->ctxt != NULL))
dict = reader->ctxt->dict;
@@ -364,18 +366,21 @@ xmlTextReaderFreeNodeList(xmlTextReaderPtr reader, xmlNodePtr cur) {
xmlFreeDoc((xmlDocPtr) cur);
return;
}
- while (cur != NULL) {
+ while (1) {
+ while ((cur->children != NULL) &&
+ (cur->children->parent == cur) &&
+ (cur->type != XML_DTD_NODE) &&
+ (cur->type != XML_ENTITY_REF_NODE)) {
+ cur = cur->children;
+ depth += 1;
+ }
+
next = cur->next;
+ parent = cur->parent;
+
/* unroll to speed up freeing the document */
if (cur->type != XML_DTD_NODE) {
- if ((cur->children != NULL) &&
- (cur->type != XML_ENTITY_REF_NODE)) {
- if (cur->children->parent == cur)
- xmlTextReaderFreeNodeList(reader, cur->children);
- cur->children = NULL;
- }
-
if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
xmlDeregisterNodeDefaultValue(cur);
@@ -414,7 +419,16 @@ xmlTextReaderFreeNodeList(xmlTextReaderPtr reader, xmlNodePtr cur) {
xmlFree(cur);
}
}
- cur = next;
+
+ if (next != NULL) {
+ cur = next;
+ } else {
+ if ((depth == 0) || (parent == NULL))
+ break;
+ depth -= 1;
+ cur = parent;
+ cur->children = NULL;
+ }
}
}
--
1.7.12.4
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