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

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Date:   Tue, 16 Aug 2022 15:55:50 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] mm/hugetlb: fix WARN_ON(!kobj) in
 sysfs_create_group()

On 08/16/22 21:05, Miaohe Lin wrote:
> 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.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/hugetlb.c | 1 +
>  1 file changed, 1 insertion(+)

Thanks!

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz

> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index e72052964fb5..ff991e5bdf1f 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3846,6 +3846,7 @@ 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
>