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

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Message-ID: <20251219074232.136482-1-ranxiaokai627@163.com>
Date: Fri, 19 Dec 2025 07:42:32 +0000
From: ranxiaokai627@....com
To: akpm@...ux-foundation.org,
	vbabka@...e.cz,
	surenb@...gle.com,
	mhocko@...e.com,
	jackmanb@...gle.com,
	hannes@...xchg.org,
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	=osalvador@...e.de
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	ran.xiaokai@....com.cn,
	ranxiaokai627@....com
Subject: [PATCH] mm/page_owner: fix memory leak in page_owner_stack_fops->release()

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")
Signed-off-by: Ran Xiaokai <ran.xiaokai@....com.cn>
---
 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)
-- 
2.25.1