# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1580507104 -3600
# Node ID a20c66f13a6ebb1a630073197b49490810916430
# Parent  f2a4030c918abb907df9ff9696bdb5b1d400593e
patch 8.2.0189: cd() with NULL argument crashes

Commit: https://github.com/vim/vim/commit/7cc96923c44bbcc541cbd211b6308d87a965f0c3
Author: Bram Moolenaar <Bram@vim.org>
Date:   Fri Jan 31 22:41:38 2020 +0100

    patch 8.2.0189: cd() with NULL argument crashes

    Problem:    cd() with NULL argument crashes.
    Solution:   Check for NULL. (Ken Takata, closes https://github.com/vim/vim/issues/5558)

diff --git a/src/ex_docmd.c b/src/ex_docmd.c
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -6572,7 +6572,7 @@ changedir_func(
     int		dir_differs;
     int		retval = FALSE;
 
-    if (allbuf_locked())
+    if (new_dir == NULL || allbuf_locked())
 	return FALSE;
 
     if (vim_strchr(p_cpo, CPO_CHDIR) != NULL && curbufIsChanged() && !forceit)
diff --git a/src/testdir/test_cd.vim b/src/testdir/test_cd.vim
--- a/src/testdir/test_cd.vim
+++ b/src/testdir/test_cd.vim
@@ -101,6 +101,8 @@ func Test_chdir_func()
   call assert_fails("call chdir('dir-abcd')", 'E472:')
   silent! let d = chdir("dir_abcd")
   call assert_equal("", d)
+  " Should not crash
+  call chdir(d)
 
   only | tabonly
   call chdir(topdir)
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    189,
+/**/
     188,
 /**/
     187,