From 7394a508e0954e2ac921ed6a9df82aeaa4942cb9 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 13 Jun 2019 06:03:06 +0530
Subject: [PATCH] Fix an infinite loop in the LRF renderer

---
 src/calibre/gui2/lrf_renderer/text.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/gui2/lrf_renderer/text.py b/src/calibre/gui2/lrf_renderer/text.py
index 2f050a2e89..9231a17325 100644
--- a/src/calibre/gui2/lrf_renderer/text.py
+++ b/src/calibre/gui2/lrf_renderer/text.py
@@ -315,6 +315,8 @@ class TextBlock(object):
             raw = raw[pos:]
             if line_filled:
                 self.end_line()
+            if not pos:
+                break
 
     def __iter__(self):
         for line in self.lines: