Patch 8.2.0381
Problem:    Using freed memory with :lvimgrep and autocommand. (extracted from
            POC by Dominique Pelle)
Solution:   Avoid deleting a dummy buffer used in a window. (closes #5777)
Files:      src/quickfix.c, src/testdir/test_quickfix.vim


*** ../vim-8.2.0380/src/quickfix.c      2020-02-21 21:30:33.871979710 +0100
--- src/quickfix.c      2020-03-14 17:14:21.565086331 +0100
***************
*** 6268,6274 ****
      static void
  wipe_dummy_buffer(buf_T *buf, char_u *dirname_start)
  {
!     if (curbuf != buf)                // safety check
      {
  #if defined(FEAT_EVAL)
        cleanup_T   cs;
--- 6268,6293 ----
      static void
  wipe_dummy_buffer(buf_T *buf, char_u *dirname_start)
  {
!     // If any autocommand opened a window on the dummy buffer, close that
!     // window.  If we can't close them all then give up.
!     while (buf->b_nwindows > 0)
!     {
!       int         did_one = FALSE;
!       win_T       *wp;
! 
!       if (firstwin->w_next != NULL)
!           for (wp = firstwin; wp != NULL; wp = wp->w_next)
!               if (wp->w_buffer == buf)
!               {
!                   if (win_close(wp, FALSE) == OK)
!                       did_one = TRUE;
!                   break;
!               }
!       if (!did_one)
!           return;
!     }
! 
!     if (curbuf != buf && buf->b_nwindows == 0)        // safety check
      {
  #if defined(FEAT_EVAL)
        cleanup_T   cs;
*** ../vim-8.2.0380/src/testdir/test_quickfix.vim       2020-02-21 
17:54:41.830235712 +0100
--- src/testdir/test_quickfix.vim       2020-03-14 17:15:39.208786913 +0100
***************
*** 3684,3689 ****
--- 3684,3697 ----
    enew | only
  endfunc
  
+ func Test_lvimgrep_crash2()
+   au BufNewFile x sfind
+   call assert_fails('lvimgrep x x', 'E480:')
+   call assert_fails('lvimgrep x x x', 'E480:')
+ 
+   au! BufNewFile
+ endfunc
+ 
  " Test for the position of the quickfix and location list window
  func Test_qfwin_pos()
    " Open two windows
*** ../vim-8.2.0380/src/version.c       2020-03-14 15:27:52.442171431 +0100
--- src/version.c       2020-03-14 17:17:58.184250044 +0100
***************
*** 740,741 ****
--- 740,743 ----
  {   /* Add new patch number below this line */
+ /**/
+     381,
  /**/

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