Commit: patch 9.1.1971: Crash when buffer gets deleted inside charconvert during save

[Christian Brabandt]

patch 9.1.1971: Crash when buffer gets deleted inside charconvert during save

Commit: https://github.com/vim/vim/commit/fe1c57cd2caa7de2ce23557646d6c62a9a1b4f92
Author: glepnir <gleph...@gmail.com>
Date: Thu Dec 11 20:45:09 2025 +0100

patch 9.1.1971: Crash when buffer gets deleted inside charconvert during save

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: #18901

Signed-off-by: glepnir <gleph...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/buffer.c b/src/buffer.c
index 90104cf0d..0ed61a703 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -516,6 +516,10 @@ can_unload_buffer(buf_T *buf)
break;
}
}
+ // Don't unload the buffer while it's still being saved
+ if (can_unload && buf->b_saving)
+ can_unload = FALSE;
+
if (!can_unload)
{
char_u *fname = buf->b_fname != NULL ? buf->b_fname : buf->b_ffname;
diff --git a/src/testdir/test_buffer.vim b/src/testdir/test_buffer.vim
index 1ffa7ae87..d688a8671 100644
--- a/src/testdir/test_buffer.vim
+++ b/src/testdir/test_buffer.vim
@@ -226,6 +226,13 @@ 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()
diff --git a/src/version.c b/src/version.c
index 2e806c33c..922242d91 100644
--- a/src/version.c
+++ b/src/version.c
@@ -729,6 +729,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 1971,
/**/
1970,
/**/