[PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

[PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

[Xishi Qiu]

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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Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

[Tang Chen]

Seems OK to me.

Thanks.

On 09/30/2015 05:33 PM, Xishi Qiu wrote:
> 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);

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Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

[David Rientjes]

On Wed, 30 Sep 2015, Xishi Qiu wrote:

> 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>

Acked-by: David Rientjes <rientjes@google.com>

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Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

[Yasuaki Ishimatsu]

On Wed, 30 Sep 2015 17:33:42 +0800
Xishi Qiu <qiuxishi@huawei.com> wrote:

> 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>
> ---

Looks good to me.

Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

Thanks,
Yasuaki Ishimatsu

>  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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