# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1635178503 -7200
# Node ID 787c8061c747cf6194f0fd46a8c9bd3ffc531856
# Parent  b392baba04784efa5baabeb5153dd3b33a409601
patch 8.2.3564: invalid memory access when scrolling without valid screen

Commit: https://github.com/vim/vim/commit/777e7c21b7627be80961848ac560cb0a9978ff43
Author: Bram Moolenaar <Bram@vim.org>
Date:   Mon Oct 25 17:07:04 2021 +0100

    patch 8.2.3564: invalid memory access when scrolling without valid screen

    Problem:    Invalid memory access when scrolling without a valid screen.
    Solution:   Do not set VALID_BOTLINE in w_valid.

diff --git a/src/move.c b/src/move.c
--- a/src/move.c
+++ b/src/move.c
@@ -199,7 +199,6 @@ update_topline(void)
 	check_cursor_lnum();
 	curwin->w_topline = curwin->w_cursor.lnum;
 	curwin->w_botline = curwin->w_topline;
-	curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
 	curwin->w_scbind_pos = 1;
 	return;
     }
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -34,14 +34,14 @@ func CountSpaces(type, ...)
   else
     silent exe "normal! `[v`]y"
   endif
-  let g:a=strlen(substitute(@@, '[^ ]', '', 'g'))
+  let g:a = strlen(substitute(@@, '[^ ]', '', 'g'))
   let &selection = sel_save
   let @@ = reg_save
 endfunc
 
 func OpfuncDummy(type, ...)
   " for testing operatorfunc
-  let g:opt=&linebreak
+  let g:opt = &linebreak
 
   if a:0  " Invoked from Visual mode, use gv command.
     silent exe "normal! gvy"
@@ -52,7 +52,7 @@ func OpfuncDummy(type, ...)
   endif
   " Create a new dummy window
   new
-  let g:bufnr=bufnr('%')
+  let g:bufnr = bufnr('%')
 endfunc
 
 func Test_normal00_optrans()
@@ -987,6 +987,22 @@ func Test_vert_scroll_cmds()
   close!
 endfunc
 
+func Test_scroll_in_ex_mode()
+  " This was using invalid memory because w_botline was invalid.
+  let lines =<< trim END
+      diffsplit
+      norm os00(
+      call writefile(['done'], 'Xdone')
+      qa!
+  END
+  call writefile(lines, 'Xscript')
+  call assert_equal(1, RunVim([], [], '--clean -X -Z -e -s -S Xscript'))
+  call assert_equal(['done'], readfile('Xdone'))
+
+  call delete('Xscript')
+  call delete('Xdone')
+endfunc
+
 " Test for the 'sidescroll' option
 func Test_sidescroll_opt()
   new
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3564,
+/**/
     3563,
 /**/
     3562,