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mm/hugetlb: fix potential double free in hugetlb_register_node() error path

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In hugetlb_sysfs_add_hstate(), we would do kobject_put() on hstate_kobjs
when failed to create sysfs group but forget to set hstate_kobjs to NULL.
Then in hugetlb_register_node() error path, we may free it again via
hugetlb_unregister_node().

Link: https://lkml.kernel.org/r/20210107123249.36964-1-linmiaohe@huawei.com
Fixes: a343787016 ("hugetlb: new sysfs interface")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <smuchun@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2021-02-24 12:06:50 -08:00 committed by Linus Torvalds
parent aba677f94b
commit cc2205a67d
1 changed files with 3 additions and 1 deletions
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4
mm/hugetlb.c
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@ -2988,8 +2988,10 @@ static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent,
return -ENOMEM;
retval = sysfs_create_group(hstate_kobjs[hi], hstate_attr_group);
if (retval)
if (retval) {
kobject_put(hstate_kobjs[hi]);
hstate_kobjs[hi] = NULL;
}
return retval;
}