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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.

Link: https://lkml.kernel.org/r/20220816130553.31406-3-linmiaohe@huawei.com
Fixes: 79dfc69552 ("hugetlb: add demote hugetlb page sysfs interfaces")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-08-16 21:05:49 +08:00 committed by Andrew Morton
parent a43a83c79b
commit 3a6bdda0b5
1 changed files with 1 additions and 0 deletions
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mm/hugetlb.c
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@ -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) {