From 456dfeaf8e5e47b4df40815596d1225f85c03e09 Mon Sep 17 00:00:00 2001
From: hius07 <62179190+hius07@users.noreply.github.com>
Date: Sat, 25 Sep 2021 11:22:47 +0300
Subject: [PATCH] Fix segfault on exit after opening fb2.zip (#8232)

---
 frontend/document/credocument.lua | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index a13c1f796..0fdf8196b 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -71,11 +71,13 @@ local CreDocument = Document:new{
 function CreDocument:zipContentExt(fname)
     local std_out = io.popen("unzip ".."-qql \""..fname.."\"")
     if std_out then
+        local size, ext
         for line in std_out:lines() do
-            local size, ext = string.match(line, "%s+(%d+)%s+.+%.([^.]+)")
-            -- return the extention
-            if size and ext then return string.lower(ext) end
+            size, ext = string.match(line, "%s+(%d+)%s+.+%.([^.]+)")
+            if size and ext then break end
         end
+        std_out:close()
+        if ext then return string.lower(ext) end
     end
 end