# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1650124804 -7200
# Node ID a7556b47ff095cf82eea6ef51362c25b10972c3b
# Parent  c2b4fd1c8441cfbd659bce962757ce8ec59ac6b8
patch 8.2.4762: using freed memory using synstack() and synID() in WinEnter

Commit: https://github.com/vim/vim/commit/ca7e86c23789eb0ed8f6400f25ea9e0e1036f9fc
Author: zeertzjq <zeertzjq@outlook.com>
Date:   Sat Apr 16 16:49:24 2022 +0100

    patch 8.2.4762: using freed memory using synstack() and synID() in WinEnter

    Problem:    Using freed memory when using synstack() and synID() in WinEnter.
    Solution:   Check using the syntax window. (closes https://github.com/vim/vim/issues/10204)

diff --git a/src/syntax.c b/src/syntax.c
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -6486,8 +6486,9 @@ syn_get_id(
     int		keep_state)  // keep state of char at "col"
 {
     // When the position is not after the current position and in the same
-    // line of the same buffer, need to restart parsing.
-    if (wp->w_buffer != syn_buf
+    // line of the same window with the same buffer, need to restart parsing.
+    if (wp != syn_win
+	    || wp->w_buffer != syn_buf
 	    || lnum != current_lnum
 	    || col < current_col)
 	syntax_start(wp, lnum);
diff --git a/src/testdir/test_syntax.vim b/src/testdir/test_syntax.vim
--- a/src/testdir/test_syntax.vim
+++ b/src/testdir/test_syntax.vim
@@ -956,5 +956,18 @@ func Test_syn_include_contains_TOP()
   bw!
 endfunc
 
+" This was using freed memory
+func Test_WinEnter_synstack_synID()
+  autocmd WinEnter * call synstack(line("."), col("."))
+  autocmd WinEnter * call synID(line('.'), col('.') - 1, 1)
+  call setline(1, 'aaaaa')
+  normal! $
+  new
+  close
+
+  au! WinEnter
+  bw!
+endfunc
+
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4762,
+/**/
     4761,
 /**/
     4760,