From ee74bc25382d40645084b0eb831525d1d908d19e Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Fri, 15 Dec 2023 16:01:29 -0500
Subject: [PATCH] LibPDF: Tolerate 0-sized Subrs in PS1 font subprograms

This regressed in 2b3a41be74a3e8 in #18031.

Fixes a crash rendering page 2 and onward of
https://pyx-project.org/presentation_dantemv35_en.pdf
---
 Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp b/Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
index 0a40383b1a..02ee14da42 100644
--- a/Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
+++ b/Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
@@ -107,7 +107,7 @@ PDFErrorOr<Vector<ByteBuffer>> PS1FontProgram::parse_subroutines(Reader& reader)
         return error("Expected array length");
 
     auto length = TRY(parse_int(reader));
-    VERIFY(length > 0);
+    VERIFY(length >= 0);
 
     Vector<ByteBuffer> array;
     TRY(array.try_resize(length));