patch 9.0.1030: using freed memory with the cmdline popup menu

Problem:    Using freed memory with the cmdline popup menu.
Solution:   Clear the popup menu when clearing the matches. (closes #11677)

src/cmdexpand.c

@@ -369,7 +369,8 @@ cmdline_pum_create(
 /*
  * Display the cmdline completion matches in a popup menu
  */
-void cmdline_pum_display(void)
+    void
+cmdline_pum_display(void)
 {
     pum_display(compl_match_array, compl_match_arraysize, compl_selected);
 }
@@ -377,7 +378,8 @@ void cmdline_pum_display(void)
 /*
  * Returns TRUE if the cmdline completion popup menu is being displayed.
  */
-int cmdline_pum_active(void)
+    int
+cmdline_pum_active(void)
 {
     return pum_visible() && compl_match_array != NULL;
 }
@@ -386,7 +388,8 @@ int cmdline_pum_active(void)
  * Remove the cmdline completion popup menu (if present), free the list of
  * items and refresh the screen.
  */
-void cmdline_pum_remove(void)
+    void
+cmdline_pum_remove(void)
 {
     int save_p_lz = p_lz;
     int	save_KeyTyped = KeyTyped;
@@ -403,7 +406,8 @@ void cmdline_pum_remove(void)
     KeyTyped = save_KeyTyped;
 }
 
-void cmdline_pum_cleanup(cmdline_info_T *cclp)
+    void
+cmdline_pum_cleanup(cmdline_info_T *cclp)
 {
     cmdline_pum_remove();
     wildmenu_cleanup(cclp);
@@ -413,7 +417,8 @@ void cmdline_pum_cleanup(cmdline_info_T *cclp)
  * Returns the starting column number to use for the cmdline completion popup
  * menu.
  */
-int cmdline_compl_startcol(void)
+    int
+cmdline_compl_startcol(void)
 {
     return compl_startcol;
 }
@@ -975,6 +980,10 @@ ExpandOne(
 	FreeWild(xp->xp_numfiles, xp->xp_files);
 	xp->xp_numfiles = -1;
 	VIM_CLEAR(orig_save);
+
+	// The entries from xp_files may be used in the PUM, remove it.
+	if (compl_match_array != NULL)
+	    cmdline_pum_remove();
     }
     findex = 0;
 

src/testdir/dumps/Test_wildmenu_pum_clear_entries_1.dump

@@ -0,0 +1,10 @@
+| +0#0000001#e0e0e08|!| @14| +0#0000000#0000001| +0&#ffffff0@56
+| +0#0000001#ffd7ff255|#| @14| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|&| @14| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|*| @14| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|+@1| @13| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|-@1| @13| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|<| @14| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|=| @14| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+| +0#0000001#ffd7ff255|>| @14| +0#0000000#a8a8a8255| +0#4040ff13#ffffff0@56
+|:+0#0000000&|!> @72

src/testdir/test_cmdline.vim

@@ -2485,6 +2485,21 @@ func Test_wildmenu_pum_from_terminal()
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_wildmenu_pum_clear_entries()
+  " This was using freed memory.  Run in a terminal to get the pum to update.
+  let lines =<< trim END
+    set wildoptions=pum
+    set wildchar=<C-E>
+  END
+  call writefile(lines, 'XwildmenuTest', 'D')
+  let buf = RunVimInTerminal('-S XwildmenuTest', #{rows: 10})
+
+  call term_sendkeys(buf, ":\<C-E>\<C-E>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_pum_clear_entries_1', {})
+
+  set wildoptions& wildchar&
+endfunc
+
 " Test for completion after a :substitute command followed by a pipe (|)
 " character
 func Test_cmdline_complete_substitute()

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1030,
 /**/
     1029,
 /**/