linux-kernel - Re: [PATCH] mm/page_owner: fix memory leak in page_owner_stack

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Message-ID: <03ccf64a-55ab-40b6-b9cd-74565df4bf34@suse.cz>
Date: Fri, 19 Dec 2025 09:58:13 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: ranxiaokai627@....com, akpm@...ux-foundation.org, surenb@...gle.com,
 mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com,
 elver@...gle.com, andreyknvl@...il.com, =osalvador@...e.de
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, ran.xiaokai@....com.cn
Subject: Re: [PATCH] mm/page_owner: fix memory leak in
 page_owner_stack_fops->release()

On 12/19/25 08:42, ranxiaokai627@....com wrote:
> From: Ran Xiaokai <ran.xiaokai@....com.cn>
> 
> The page_owner_stack_fops->open() callback invokes seq_open_private(),
> therefore its corresponding ->release() callback must call seq_release_private().
> Otherwise it will cause a memory leak of struct stack_print_ctx.
> 
> Fixes: 765973a098037 ("mm,page_owner: display all stacks and their count")

I think cc: stable is warranted, Andrew can add it if he agrees.

> Signed-off-by: Ran Xiaokai <ran.xiaokai@....com.cn>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

Thanks!

> ---
>  mm/page_owner.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/page_owner.c b/mm/page_owner.c
> index 27d19f01009c..b6a394a130ec 100644
> --- a/mm/page_owner.c
> +++ b/mm/page_owner.c
> @@ -952,7 +952,7 @@ static const struct file_operations page_owner_stack_fops = {
>  	.open		= page_owner_stack_open,
>  	.read		= seq_read,
>  	.llseek		= seq_lseek,
> -	.release	= seq_release,
> +	.release	= seq_release_private,
>  };
>  
>  static int page_owner_threshold_get(void *data, u64 *val)