From de05bb25733c3319e18dca44e9b59c6ee389eb26 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Thu, 13 Jan 2022 13:08:14 +0000
Subject: [PATCH] patch 8.2.4074: going over the end of NameBuff

Problem:    Going over the end of NameBuff.
Solution:   Check length when appending a space.

---
 src/drawscreen.c          |  9 +++++----
 src/testdir/test_edit.vim | 15 +++++++++++++++
 src/version.c             |  2 ++
 3 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/drawscreen.c b/src/drawscreen.c
index 9acb705..7425ad4 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -437,12 +437,13 @@ win_redr_status(win_T *wp, int ignore_pum UNUSED)
 	p = NameBuff;
 	len = (int)STRLEN(p);
 
-	if (bt_help(wp->w_buffer)
+	if ((bt_help(wp->w_buffer)
 #ifdef FEAT_QUICKFIX
-		|| wp->w_p_pvw
+		    || wp->w_p_pvw
 #endif
-		|| bufIsChanged(wp->w_buffer)
-		|| wp->w_buffer->b_p_ro)
+		    || bufIsChanged(wp->w_buffer)
+		    || wp->w_buffer->b_p_ro)
+		&& len < MAXPATHL - 1)
 	    *(p + len++) = ' ';
 	if (bt_help(wp->w_buffer))
 	{
diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index c3b1af5..48e6ff2 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -1532,3 +1532,18 @@ func Test_edit_put_CTRL_E()
   set encoding=utf-8
 endfunc
 
+" Weird long file name was going over the end of NameBuff
+func Test_edit_overlong_file_name()
+  CheckUnix
+
+  file 0000000000000000000000000000
+  file %%%%%%%%%%%%%%%%%%%%%%%%%%
+  file %%%%%%
+  set readonly
+  set ls=2
+
+  redraw!
+  set noreadonly ls&
+  bwipe!
+endfunc
+
-- 
2.23.0