From 9443d3994190943c2b9d8c4efefcf3de854ec7be Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Tue, 21 Jul 2020 18:51:47 -0400
Subject: vim-patch:8.2.1259: empty group in 'tabline' may cause using an
 invalid pointer

Problem:    Empty group in 'tabline' may cause using an invalid pointer.
Solution:   Set the group start position. (closes vim/vim#6505)
https://github.com/vim/vim/commit/f56c95fdad5af521887f8cd7bc15729b5355231d
---
 src/nvim/testdir/test_tabline.vim | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/nvim/testdir')

diff --git a/src/nvim/testdir/test_tabline.vim b/src/nvim/testdir/test_tabline.vim
index f24552088b..117d962d08 100644
--- a/src/nvim/testdir/test_tabline.vim
+++ b/src/nvim/testdir/test_tabline.vim
@@ -64,3 +64,28 @@ func Test_redrawtabline()
   let &showtabline = showtabline_save
   au! Bufadd
 endfunc
+
+function EmptyTabname()
+  return ""
+endfunction
+
+function MakeTabLine() abort
+  let titles = map(range(1, tabpagenr('$')), '"%( %" . v:val . "T%{EmptyTabname()}%T %)"')
+  let sep = 'あ'
+  let tabpages = join(titles, sep)
+  return tabpages .. sep .. '%=%999X X'
+endfunction
+
+func Test_tabline_empty_group()
+  " this was reading invalid memory
+  set tabline=%!MakeTabLine()
+  tabnew
+  redraw!
+
+  tabclose
+  set tabline=
+endfunc
+
+
+
+" vim: shiftwidth=2 sts=2 expandtab
-- 
cgit