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Groups > linux.kernel > #1235942

[PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

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

Signed-off-by: Xishi Qiu <qiuxishi@huawei.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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[PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes() Xishi Qiu <qiuxishi@huawei.com> - 2015-09-30 11:40 +0200
  Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes() Tang Chen <tangchen@cn.fujitsu.com> - 2015-09-30 12:40 +0200
  Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes() David Rientjes <rientjes@google.com> - 2015-09-30 23:10 +0200
  Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes() Yasuaki Ishimatsu <yasu.isimatu@gmail.com> - 2015-10-01 22:10 +0200

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