linux-kernel - [PATCH v2 2/6] mm/hugetlb: fix WARN_ON(!kobj) in sysfs_create

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Date:   Tue, 23 Aug 2022 11:02:05 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>,
        <songmuchun@...edance.com>
CC:     <lukas.bulwahn@...il.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2 2/6] mm/hugetlb: fix WARN_ON(!kobj) in sysfs_create_group()

If sysfs_create_group() fails with hstate_attr_group, hstate_kobjs[hi]
will be set to NULL. Then it will be passed to sysfs_create_group() if
h->demote_order != 0 thus triggering WARN_ON(!kobj) check. Fix this by
making sure hstate_kobjs[hi] != NULL when calling sysfs_create_group.

Fixes: 79dfc695525f ("hugetlb: add demote hugetlb page sysfs interfaces")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
---
 mm/hugetlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 19a7a83af569..d46dfe5ba62c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3847,6 +3847,7 @@ static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent,
 	if (retval) {
 		kobject_put(hstate_kobjs[hi]);
 		hstate_kobjs[hi] = NULL;
+		return retval;
 	}
 
 	if (h->demote_order) {
-- 
2.23.0