From fa471bfaaf967006c4749ee7b9b845aac51276f0 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Thu, 25 Jul 2013 16:58:26 +0200
Subject: [PATCH] 	* include/grub/video.h (grub_video_register): Keep
 double-linked as 	well as single-linked invariants. 	Reported by:
 qwertial.

---
 ChangeLog            | 6 ++++++
 include/grub/video.h | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 7b987f832..df966d021 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2013-07-25  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* include/grub/video.h (grub_video_register): Keep double-linked as
+	well as single-linked invariants.
+	Reported by: qwertial.
+
 2013-07-25  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/commands/nativedisk.c (get_uuid): Handle
diff --git a/include/grub/video.h b/include/grub/video.h
index c444536bf..5dd99c136 100644
--- a/include/grub/video.h
+++ b/include/grub/video.h
@@ -400,6 +400,10 @@ grub_video_register (grub_video_adapter_t adapter)
        p = &((*p)->next));
   adapter->next = *p;
   *p = adapter;
+
+  adapter->prev = p;
+  if (adapter->next)
+    adapter->next->prev = &adapter->next;
 }
 #endif