From 9d418dcc6d15539a9567b2ad7fe7473648989f44 Mon Sep 17 00:00:00 2001
From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Date: Wed, 6 Aug 2014 16:09:40 -0700
Subject: [PATCH] lib: list_sort_test(): add extra corruption check

Add a check to make sure that the prev pointer of the list head points
to the last element on the list.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Don Mullis <don.mullis@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 lib/list_sort.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/list_sort.c b/lib/list_sort.c
index 291412ade89a..fbdbc867b252 100644
--- a/lib/list_sort.c
+++ b/lib/list_sort.c
@@ -272,6 +272,11 @@ static int __init list_sort_test(void)
 		}
 		count++;
 	}
+	if (head.prev != cur) {
+		printk(KERN_ERR "list_sort_test: error: list is corrupted\n");
+		goto exit;
+	}
+
 
 	if (count != TEST_LIST_LEN) {
 		printk(KERN_ERR "list_sort_test: error: bad list length %d",
-- 
2.20.1