From 4fa60739f2b9f7230e272c7851dfb4edc702ee11 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Thu, 3 Oct 2013 23:32:19 +0200
Subject: [PATCH] 	* grub-core/term/gfxterm.c: Add flag "functional" to
 skip input when 	changing windows to avoid crash.

---
 ChangeLog                |  5 +++++
 grub-core/term/gfxterm.c | 13 ++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 0a3da2a46..484faa053 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-10-03  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* grub-core/term/gfxterm.c: Add flag "functional" to skip input when
+	changing windows to avoid crash.
+
 2013-10-03  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/kern/arm/cache.c: Add v5 write-through cache support.
diff --git a/grub-core/term/gfxterm.c b/grub-core/term/gfxterm.c
index e7806b92c..e7d5af4e8 100644
--- a/grub-core/term/gfxterm.c
+++ b/grub-core/term/gfxterm.c
@@ -97,6 +97,8 @@ struct grub_virtual_screen
   struct grub_colored_char *text_buffer;
 
   int total_scroll;
+
+  int functional;
 };
 
 struct grub_gfxterm_window
@@ -178,6 +180,8 @@ clear_char (struct grub_colored_char *c)
 static void
 grub_virtual_screen_free (void)
 {
+  virtual_screen.functional = 0;
+
   /* If virtual screen has been allocated, free it.  */
   if (virtual_screen.text_buffer != 0)
     {
@@ -264,8 +268,12 @@ grub_virtual_screen_setup (unsigned int x, unsigned int y,
       virtual_screen.text_buffer[i].code.ncomb = 0;
       clear_char (&(virtual_screen.text_buffer[i]));
     }
+  if (grub_errno)
+    return grub_errno;
 
-  return grub_errno;
+  virtual_screen.functional = 1;
+
+  return GRUB_ERR_NONE;
 }
 
 void
@@ -814,6 +822,9 @@ static void
 grub_gfxterm_putchar (struct grub_term_output *term,
 		      const struct grub_unicode_glyph *c)
 {
+  if (!virtual_screen.functional)
+    return;
+
   if (c->base == '\a')
     /* FIXME */
     return;