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From babe75030c7f64a37826bb3342317134568bef61 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sat, 1 May 2021 16:53:33 +0200
Subject: [PATCH] Propagate error in xmlParseElementChildrenContentDeclPriv
Check return value of recursive calls to
xmlParseElementChildrenContentDeclPriv and return immediately in case
of errors. Otherwise, struct xmlElementContent could contain unexpected
null pointers, leading to a null deref when post-validating documents
which aren't well-formed and parsed in recovery mode.
Fixes #243.
Reference:https://github.com/GNOME/libxml2/commit/babe75030c7f64a37826bb3342317134568bef61
Conflict:NA
---
parser.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/parser.c b/parser.c
index b42e604..73c27ed 100644
--- a/parser.c
+++ b/parser.c
@@ -6208,6 +6208,8 @@ xmlParseElementChildrenContentDeclPriv(xmlParserCtxtPtr ctxt, int inputchk,
SKIP_BLANKS;
cur = ret = xmlParseElementChildrenContentDeclPriv(ctxt, inputid,
depth + 1);
+ if (cur == NULL)
+ return(NULL);
SKIP_BLANKS;
GROW;
} else {
@@ -6341,6 +6343,11 @@ xmlParseElementChildrenContentDeclPriv(xmlParserCtxtPtr ctxt, int inputchk,
SKIP_BLANKS;
last = xmlParseElementChildrenContentDeclPriv(ctxt, inputid,
depth + 1);
+ if (last == NULL) {
+ if (ret != NULL)
+ xmlFreeDocElementContent(ctxt->myDoc, ret);
+ return(NULL);
+ }
SKIP_BLANKS;
} else {
elem = xmlParseName(ctxt);
--
1.8.3.1
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