linux-kernel - [PATCH] mm: fix overflow in find_zone_movable_pfns_for

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Message-ID: <560BAC76.6050002@huawei.com>
Date:	Wed, 30 Sep 2015 17:33:42 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Tang Chen <tangchen@...fujitsu.com>, <zhongjiang@...wei.com>,
	"Yasuaki Ishimatsu" <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

If user set "movablecore=xx" to a large number, corepages will overflow,
this patch fix the problem.

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 mm/page_alloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 48aaf7b..af3c9bd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5668,6 +5668,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
 		 */
 		required_movablecore =
 			roundup(required_movablecore, MAX_ORDER_NR_PAGES);
+		required_movablecore = min(totalpages, required_movablecore);
 		corepages = totalpages - required_movablecore;
 
 		required_kernelcore = max(required_kernelcore, corepages);
-- 
2.0.0


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