Patch 8.2.4762

[Bram Moolenaar]

Patch 8.2.4762
Problem: Using freed memory when using synstack() and synID() in WinEnter.
Solution: Check using the syntax window. (closes #10204)
Files: src/syntax.c, src/testdir/test_syntax.vim


*** ../vim-8.2.4761/src/syntax.c 2022-04-07 13:26:30.153944670 +0100
--- src/syntax.c 2022-04-16 16:47:37.758683489 +0100
***************
*** 6486,6493 ****
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
|| lnum != current_lnum
|| col < current_col)
syntax_start(wp, lnum);
--- 6486,6494 ----
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 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);
*** ../vim-8.2.4761/src/testdir/test_syntax.vim 2021-12-17 17:32:26.101900897 +0000
--- src/testdir/test_syntax.vim 2022-04-16 16:42:41.246708401 +0100
***************
*** 956,960 ****
--- 956,973 ----
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
*** ../vim-8.2.4761/src/version.c 2022-04-16 15:18:19.428831638 +0100
--- src/version.c 2022-04-16 16:48:01.174679196 +0100
***************
*** 748,749 ****
--- 748,751 ----
{ /* Add new patch number below this line */
+ /**/
+ 4762,
/**/

--
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/// Bram Moolenaar -- Br...@Moolenaar.net -- http://www.Moolenaar.net \\\
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