From 82f30bfeda2f291d3b2f3d8fee79dd9ace42a9aa Mon Sep 17 00:00:00 2001
From: Michael Ennen <brcolow@users.noreply.github.com>
Date: Fri, 21 Oct 2016 09:55:57 -0700
Subject: [RFC] vim-patch:7.4.1704 (#5487)

vim-patch:7.4.1704

Problem:    Using freed memory with "wincmd p". (Dominique Pelle)
Solution:   Also clear "prevwin" in other tab pages.

https://github.com/vim/vim/commit/3dda7db4e1f7c4a8110a1f83001ec36b46693d27
---
 src/nvim/window.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'src/nvim/window.c')

diff --git a/src/nvim/window.c b/src/nvim/window.c
index 29c670322a..03a2e9a842 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -278,10 +278,11 @@ newwindow:
   /* cursor to last accessed (previous) window */
   case 'p':
   case Ctrl_P:
-    if (prevwin == NULL)
+    if (!win_valid(prevwin)) {
       beep_flush();
-    else
+    } else {
       win_goto(prevwin);
+    }
     break;
 
   /* exchange current and next window */
@@ -3768,8 +3769,15 @@ win_free (
   hash_init(&wp->w_vars->dv_hashtab);
   unref_var_dict(wp->w_vars);
 
-  if (prevwin == wp)
+  if (prevwin == wp) {
     prevwin = NULL;
+  }
+  FOR_ALL_TABS(ttp) {
+    if (ttp->tp_prevwin == wp) {
+      ttp->tp_prevwin = NULL;
+    }
+  }
+
   win_free_lsize(wp);
 
   for (i = 0; i < wp->w_tagstacklen; ++i)
-- 
cgit