From 5131f224da93f2e042a4b22545ef62b1b2ab8460 Mon Sep 17 00:00:00 2001
From: Sean Dewar <6256228+seandewar@users.noreply.github.com>
Date: Mon, 4 Mar 2024 19:09:26 +0100
Subject: patch 9.1.0149: null pointer member access when accessing 'winfixbuf'
 property

Problem:  qf_goto_win_with_qfl_file may check if prevwin has 'winfixbuf'
          set without checking if it's valid first.
Solution: Reverse the condition. Add a test, a modeline, and a missing
          CheckFeature. (Searn Dewar)

closes: #14140

Signed-off-by: Sean Dewar <6256228+seandewar@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
---
 src/testdir/test_winfixbuf.vim | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/testdir')

diff --git a/src/testdir/test_winfixbuf.vim b/src/testdir/test_winfixbuf.vim
index 0b15983932..2dffbe1f03 100644
--- a/src/testdir/test_winfixbuf.vim
+++ b/src/testdir/test_winfixbuf.vim
@@ -1576,6 +1576,7 @@ endfunc
 
 " Fail vim.command if we try to change buffers while 'winfixbuf' is set
 func Test_lua_command()
+  CheckFeature lua
   call s:reset_all_buffers()
 
   enew
@@ -3129,3 +3130,21 @@ func Test_wprevious()
   call delete("middle")
   call delete("last")
 endfunc
+
+func Test_quickfix_switchbuf_invalid_prevwin()
+  call s:reset_all_buffers()
+
+  let [l:first, _] = s:make_simple_quickfix()
+  call assert_notequal(l:first, bufnr())
+  call assert_equal(1, winnr('$'))
+
+  set switchbuf=uselast
+  split
+  copen
+  execute winnr('#') 'quit'
+
+  call assert_fails('cfirst', 'E1513:')
+  set switchbuf&
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab
-- 
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