From 6669de1b235843968e88844ca6d3c8dec4b01a9e Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 21 Aug 2022 20:33:47 +0100
Subject: [PATCH] patch 9.0.0240: crash when using ":mkspell" with an empty
 .dic file

Problem:    Crash when using ":mkspell" with an empty .dic file.
Solution:   Check for an empty word tree.
---
 src/spellfile.c                |  4 +++-
 src/testdir/test_spellfile.vim | 12 ++++++++++++
 src/version.c                  |  2 ++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/spellfile.c b/src/spellfile.c
index 5962a1048f6fb..7620affee8e9c 100644
--- a/src/spellfile.c
+++ b/src/spellfile.c
@@ -5585,10 +5585,12 @@ sug_filltree(spellinfo_T *spin, slang_T *slang)
 
     /*
      * Go through the whole case-folded tree, soundfold each word and put it
-     * in the trie.
+     * in the trie.  Bail out if the tree is empty.
      */
     byts = slang->sl_fbyts;
     idxs = slang->sl_fidxs;
+    if (byts == NULL || idxs == NULL)
+	return FAIL;
 
     arridx[0] = 0;
     curi[0] = 1;
diff --git a/src/testdir/test_spellfile.vim b/src/testdir/test_spellfile.vim
index 43dfad4628b67..28e69bdc5da66 100644
--- a/src/testdir/test_spellfile.vim
+++ b/src/testdir/test_spellfile.vim
@@ -1168,4 +1168,16 @@ def Test_spellfile_allow_at_character()
   delete('Xtest', 'rf')
 enddef
 
+" this was using a NULL pointer
+func Test_mkspell_empty_dic()
+  call writefile(['1'], 'XtestEmpty.dic')
+  call writefile(['SOFOFROM abcd', 'SOFOTO ABCD', 'SAL CIA X'], 'XtestEmpty.aff')
+  mkspell! XtestEmpty.spl XtestEmpty
+
+  call delete('XtestEmpty.dic')
+  call delete('XtestEmpty.aff')
+  call delete('XtestEmpty.spl')
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index fe100c81026c1..9e77abceea2cc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -731,6 +731,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    240,
 /**/
     239,
 /**/