From 5b7e1f5232c6bb42469f0b5aac347af3fb7df244 Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Fri, 12 Nov 2021 16:17:02 +0100
Subject: [PATCH] XFA - Avoid an exception when looking for a font in a parent
 node   - it aims to fix issue https://github.com/mozilla/pdf.js/issues/14150;
   - a parent can be null in case the root has been reached, so just add a
 check.

---
 src/core/xfa/html_utils.js        | 2 +-
 test/pdfs/xfa_issue14150.pdf.link | 1 +
 test/test_manifest.json           | 9 +++++++++
 3 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 test/pdfs/xfa_issue14150.pdf.link

diff --git a/src/core/xfa/html_utils.js b/src/core/xfa/html_utils.js
index 2f850ab37..92897baac 100644
--- a/src/core/xfa/html_utils.js
+++ b/src/core/xfa/html_utils.js
@@ -238,7 +238,7 @@ function layoutNode(node, availableSpace) {
     if (!font) {
       const root = node[$getTemplateRoot]();
       let parent = node[$getParent]();
-      while (parent !== root) {
+      while (parent && parent !== root) {
         if (parent.font) {
           font = parent.font;
           break;
diff --git a/test/pdfs/xfa_issue14150.pdf.link b/test/pdfs/xfa_issue14150.pdf.link
new file mode 100644
index 000000000..da6a4202e
--- /dev/null
+++ b/test/pdfs/xfa_issue14150.pdf.link
@@ -0,0 +1 @@
+https://github.com/mozilla/pdf.js/files/7528643/dol4n.pdf
diff --git a/test/test_manifest.json b/test/test_manifest.json
index a1e0f449b..8eea3d06d 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -1013,6 +1013,15 @@
        "link": true,
        "type": "load"
     },
+    {  "id": "xfa_issue14150",
+       "file": "pdfs/xfa_issue14150.pdf",
+       "md5": "295b3e513b62945fbba73bce6908344c",
+       "link": true,
+       "rounds": 1,
+       "enableXfa": true,
+       "lastPage": 1,
+       "type": "eq"
+    },
     {  "id": "xfa_issue14071",
        "file": "pdfs/xfa_issue14071.pdf",
        "md5": "7ef09705091602668ce22086c83a90f3",