From 8ab375706e6712308f8cf7529bcae56684a6f385 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Wed, 3 Feb 2021 21:56:59 +0100
Subject: patch 8.2.2464: using freed memory if window closed in autocommand

Problem:    Using freed memory if window closed in autocommand. (houyunsong)
Solution:   Check the window still exists.
---
 src/ex_cmds.c                |  4 +++-
 src/testdir/test_autocmd.vim | 11 +++++++++++
 src/version.c                |  2 ++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index b678f6699..b6e1cbf7f 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -2768,7 +2768,9 @@ do_ecmd(
 		did_decrement = close_buffer(oldwin, curbuf,
 			 (flags & ECMD_HIDE) ? 0 : DOBUF_UNLOAD, FALSE, FALSE);
 
-		the_curwin->w_closing = FALSE;
+		// Autocommands may have closed the window.
+		if (win_valid(the_curwin))
+		    the_curwin->w_closing = FALSE;
 		--buf->b_locked;
 
 #ifdef FEAT_EVAL
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 71f8d2d60..b1a235c8f 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -2726,4 +2726,15 @@ func Test_BufNew_arglocal()
   au! BufNew
 endfunc
 
+func Test_autocmd_closes_window()
+  au BufNew,BufWinLeave * e %e
+  file yyy
+  au BufNew,BufWinLeave * ball
+  call assert_fails('n xxx', 'E143:')
+
+  bwipe %
+  au! BufNew
+  au! BufWinLeave
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 53ed13c73..a93b81a41 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2464,
 /**/
     2463,
 /**/
-- 
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