From f8872bccbe431ce8af50929841cf16daf13a2d2a Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Sat, 1 Aug 2026 07:25:28 +0800
Subject: [PATCH] vim-patch:9.2.0882: :bwipe crashes if WinLeave wipes all
 other buffers (#41082)

Problem:  :bwipe crashes if WinLeave wipes all other buffers
          (after 9.1.2068).
Solution: Check for NULL pointer.

related: neovim/neovim#41066
closes: vim/vim#20888

https://github.com/vim/vim/commit/3e4019a082701f48bb44de0cc7a92f6a3077bd4e
---
 src/nvim/buffer.c                | 2 +-
 test/old/testdir/test_buffer.vim | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index 29996f64a3..b02a53736b 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -1626,7 +1626,7 @@ static int do_buffer_ext(int action, int start, int dir, int count, int flags)
     }
     if (buf == NULL) {          // Still no buffer, just take one
       buf = curbuf->b_next != NULL ? curbuf->b_next : curbuf->b_prev;
-      if (bt_quickfix(buf) || (buf != curbuf && buf->b_locked_split)) {
+      if (bt_quickfix(buf) || (buf != NULL && buf != curbuf && buf->b_locked_split)) {
         buf = NULL;
       }
     }
diff --git a/test/old/testdir/test_buffer.vim b/test/old/testdir/test_buffer.vim
index c025811b53..7828acc31d 100644
--- a/test/old/testdir/test_buffer.vim
+++ b/test/old/testdir/test_buffer.vim
@@ -937,6 +937,13 @@ func Test_split_window_in_BufLeave_from_switching_buffer()
   bwipe! Xb
 endfunc
 
+func Test_wipe_other_buffers_in_WinLeave_from_bwipe()
+  tabnew
+  autocmd WinLeave * ++once 1,$-1bwipe!
+  " This should not crash
+  $bwipe!
+endfunc
+
 " Switch to a buffer whose name contains '%' via completion (#20529).
 func Test_buffer_switch_to_name_with_percent()
   CheckMSWindows