From 4d508e2f0967ccdfd70d3b1665ea8027aa98e8b9 Mon Sep 17 00:00:00 2001
From: Hajime Tazaki <tazaki@sfc.wide.ad.jp>
Date: Tue, 14 Jul 2015 17:37:15 +0900
Subject: [PATCH] lib: add sanity check for internal table deletion

Signed-off-by: Hajime Tazaki <tazaki@sfc.wide.ad.jp>
---
 arch/lib/timer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/lib/timer.c b/arch/lib/timer.c
index eb1ab004d693..0c9a78defd40 100644
--- a/arch/lib/timer.c
+++ b/arch/lib/timer.c
@@ -191,7 +191,9 @@ int del_timer(struct timer_list *timer)
 	l_timer = lib_timer_find(timer);
 	if (l_timer != NULL && l_timer->event != NULL) {
 		lib_event_cancel(l_timer->event);
-		hlist_del(&l_timer->t_hash);
+
+		if (l_timer->t_hash.next != LIST_POISON1)
+			hlist_del(&l_timer->t_hash);
 		lib_free(l_timer);
 		retval = 1;
 	} else {