# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1565125205 -7200
# Node ID cc68aca87c1788046e58fbe44597a75559799e3a
# Parent  9efb4dda972060501e4fdf5adf7af3b44be9da29
patch 8.1.1824: crash when correctly spelled word is very long

commit https://github.com/vim/vim/commit/5bcc5a1ff94bbab1b175e35a72e3df974106b393
Author: Bram Moolenaar <Bram@vim.org>
Date:   Tue Aug 6 22:48:02 2019 +0200

    patch 8.1.1824: crash when correctly spelled word is very long

    Problem:    Crash when correctly spelled word is very long. (Ben Kraft)
    Solution:   Check word length before copying. (closes https://github.com/vim/vim/issues/4778)

diff --git a/src/spell.c b/src/spell.c
--- a/src/spell.c
+++ b/src/spell.c
@@ -2073,6 +2073,8 @@ count_common_word(
 
     if (len == -1)
 	p = word;
+    else if (len >= MAXWLEN)
+	return;
     else
     {
 	vim_strncpy(buf, word, len);
diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -1,4 +1,5 @@
 " Test spell checking
+" Note: this file uses latin1 encoding, but is used with utf-8 encoding.
 
 source check.vim
 CheckFeature spell
@@ -398,6 +399,18 @@ func Test_zeq_crash()
   bwipe!
 endfunc
 
+" Check handling a word longer than MAXWLEN.
+func Test_spell_long_word()
+  set enc=utf-8
+  new
+  call setline(1, "d\xCC\xB4\xCC\xBD\xCD\x88\xCD\x94a\xCC\xB5\xCD\x84\xCD\x84\xCC\xA8\xCD\x9Cr\xCC\xB5\xCC\x8E\xCD\x85\xCD\x85k\xCC\xB6\xCC\x89\xCC\x9D \xCC\xB6\xCC\x83\xCC\x8F\xCC\xA4\xCD\x8Ef\xCC\xB7\xCC\x81\xCC\x80\xCC\xA9\xCC\xB0\xCC\xAC\xCC\xA2\xCD\x95\xCD\x87\xCD\x8D\xCC\x9E\xCD\x99\xCC\xAD\xCC\xAB\xCC\x97\xCC\xBBo\xCC\xB6\xCC\x84\xCC\x95\xCC\x8C\xCC\x8B\xCD\x9B\xCD\x9C\xCC\xAFr\xCC\xB7\xCC\x94\xCD\x83\xCD\x97\xCC\x8C\xCC\x82\xCD\x82\xCD\x80\xCD\x91\xCC\x80\xCC\xBE\xCC\x82\xCC\x8F\xCC\xA3\xCD\x85\xCC\xAE\xCD\x8D\xCD\x99\xCC\xBC\xCC\xAB\xCC\xA7\xCD\x88c\xCC\xB7\xCD\x83\xCC\x84\xCD\x92\xCC\x86\xCC\x83\xCC\x88\xCC\x92\xCC\x94\xCC\xBE\xCC\x9D\xCC\xAF\xCC\x98\xCC\x9D\xCC\xBB\xCD\x8E\xCC\xBB\xCC\xB3\xCC\xA3\xCD\x8E\xCD\x99\xCC\xA5\xCC\xAD\xCC\x99\xCC\xB9\xCC\xAE\xCC\xA5\xCC\x9E\xCD\x88\xCC\xAE\xCC\x9E\xCC\xA9\xCC\x97\xCC\xBC\xCC\x99\xCC\xA5\xCD\x87\xCC\x97\xCD\x8E\xCD\x94\xCC\x99\xCC\x9D\xCC\x96\xCD\x94\xCC\xAB\xCC\xA7\xCC\xA5\xCC\x98\xCC\xBB\xCC\xAF\xCC\xABe\xCC\xB7\xCC\x8E\xCC\x82\xCD\x86\xCD\x9B\xCC\x94\xCD\x83\xCC\x85\xCD\x8A\xCD\x8C\xCC\x8B\xCD\x92\xCD\x91\xCC\x8F\xCC\x81\xCD\x95\xCC\xA2\xCC\xB9\xCC\xB2\xCD\x9C\xCC\xB1\xCC\xA6\xCC\xB3\xCC\xAF\xCC\xAE\xCC\x9C\xCD\x99s\xCC\xB8\xCC\x8C\xCC\x8E\xCC\x87\xCD\x81\xCD\x82\xCC\x86\xCD\x8C\xCD\x8C\xCC\x8B\xCC\x84\xCC\x8C\xCD\x84\xCD\x9B\xCD\x86\xCC\x93\xCD\x90\xCC\x85\xCC\x94\xCD\x98\xCD\x84\xCD\x92\xCD\x8B\xCC\x90\xCC\x83\xCC\x8F\xCD\x84\xCD\x81\xCD\x9B\xCC\x90\xCD\x81\xCC\x8F\xCC\xBD\xCC\x88\xCC\xBF\xCC\x88\xCC\x84\xCC\x8E\xCD\x99\xCD\x94\xCC\x99\xCD\x99\xCC\xB0\xCC\xA8\xCC\xA3\xCC\xA8\xCC\x96\xCC\x99\xCC\xAE\xCC\xBC\xCC\x99\xCD\x9A\xCC\xB2\xCC\xB1\xCC\x9F\xCC\xBB\xCC\xA6\xCD\x85\xCC\xAA\xCD\x89\xCC\x9D\xCC\x99\xCD\x96\xCC\xB1\xCC\xB1\xCC\x99\xCC\xA6\xCC\xA5\xCD\x95\xCC\xB2\xCC\xA0\xCD\x99 within")
+  set spell spelllang=en
+  redraw
+  redraw!
+  bwipe!
+  set nospell
+endfunc
+
 func LoadAffAndDic(aff_contents, dic_contents)
   set enc=latin1
   set spellfile=
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1824,
+/**/
     1823,
 /**/
     1822,