From a4fb21308d1510137ec5115b8a858c3aae7b5b28 Mon Sep 17 00:00:00 2001
From: Andreas Kling <andreas@ladybird.org>
Date: Tue, 15 Jul 2025 00:16:06 +0200
Subject: [PATCH] LibWeb: Don't add range data for FontCascadeList with no
 Unicode ranges

This fixes a bunch of WPT crashes in /html/canvas/offscreen/text/
---
 Libraries/LibGfx/FontCascadeList.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Libraries/LibGfx/FontCascadeList.cpp b/Libraries/LibGfx/FontCascadeList.cpp
index 45cc71ceab3..725ca9d2cc9 100644
--- a/Libraries/LibGfx/FontCascadeList.cpp
+++ b/Libraries/LibGfx/FontCascadeList.cpp
@@ -15,6 +15,10 @@ void FontCascadeList::add(NonnullRefPtr<Font const> font)
 
 void FontCascadeList::add(NonnullRefPtr<Font const> font, Vector<UnicodeRange> unicode_ranges)
 {
+    if (unicode_ranges.is_empty()) {
+        m_fonts.append({ move(font), {} });
+        return;
+    }
     u32 lowest_code_point = 0xFFFFFFFF;
     u32 highest_code_point = 0;