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

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Message-Id: <AA374889-2C8B-4D8B-9542-A760267F00E4@linux.dev>
Date:   Wed, 17 Aug 2022 10:31:07 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, mike.kravetz@...cle.com,
        Muchun Song <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 Aug 16, 2022, at 21:05, Miaohe Lin <linmiaohe@...wei.com> 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>

It’s better to add a Fixes tag here.

Reviewed-by: Muchun Song <songmuchun@...edance.com>

Thanks.