From e9da68effe35798fa40b8325c3eeedf734275cfe Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Fri, 12 Dec 2025 08:54:18 +0800
Subject: [PATCH] vim-patch:9.1.1971: Crash when buffer gets deleted inside
 charconvert during save
MIME-Version: 1.0
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Problem:  Crash when buffer gets deleted inside charconvert during save
Solution: Check for `b_saving` inside `can_unload_buffer()`, so we don’t try to
          unload a buffer while it’s still being saved (glepnir).

closes: vim/vim#18901

https://github.com/vim/vim/commit/fe1c57cd2caa7de2ce23557646d6c62a9a1b4f92

Co-authored-by: glepnir <glephunter@gmail.com>
---
 src/nvim/buffer.c                | 5 +++++
 test/old/testdir/test_buffer.vim | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index eb149056ce..25724d28c2 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -479,6 +479,11 @@ static bool can_unload_buffer(buf_T *buf)
       }
     }
   }
+  // Don't unload the buffer while it's still being saved
+  if (can_unload && buf->b_saving) {
+    can_unload = false;
+  }
+
   if (!can_unload) {
     char *fname = buf->b_fname != NULL ? buf->b_fname : buf->b_ffname;
     semsg(_(e_attempt_to_delete_buffer_that_is_in_use_str),
diff --git a/test/old/testdir/test_buffer.vim b/test/old/testdir/test_buffer.vim
index 97ef48ef28..156a5131e0 100644
--- a/test/old/testdir/test_buffer.vim
+++ b/test/old/testdir/test_buffer.vim
@@ -228,6 +228,13 @@ func Test_buffer_error()
   %bwipe
 endfunc
 
+func Test_bwipe_during_save()
+  set charconvert=execute('%bw!')
+  call assert_fails('write ++enc=lmao boom', 'E937:')
+
+  %bwipe
+endfunc
+
 " Test for the status messages displayed when unloading, deleting or wiping
 " out buffers
 func Test_buffer_statusmsg()