linux-kernel - [PATCH] mm: incorrect overflow check in shrink

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Message-Id: <0D9D9F79-204D-4460-8CE7-A583C5C38A1E@gmail.com>
Date:	Thu, 1 Dec 2011 04:20:34 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <jweiner@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: incorrect overflow check in shrink_slab()

total_scan is unsigned long, so the overflow check (total_scan < 0)
didn't work.

Signed-off-by: Xi Wang <xi.wang@...il.com>
---
 mm/vmscan.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a1893c0..46a04e7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -270,7 +270,7 @@ unsigned long shrink_slab(struct shrink_control *shrink,
 		delta *= max_pass;
 		do_div(delta, lru_pages + 1);
 		total_scan += delta;
-		if (total_scan < 0) {
+		if ((long)total_scan < 0) {
 			printk(KERN_ERR "shrink_slab: %pF negative objects to "
 			       "delete nr=%ld\n",
 			       shrinker->shrink, total_scan);
-- 
1.7.5.4


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