From: Miaohe Lin <linmiaohe@huawei.com>
To: <akpm@linux-foundation.org>, <mike.kravetz@oracle.com>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
<linmiaohe@huawei.com>
Subject: [PATCH] mm/hugetlb: Fix potential double free in hugetlb_register_node() error path
Date: Thu, 7 Jan 2021 07:32:49 -0500 [thread overview]
Message-ID: <20210107123249.36964-1-linmiaohe@huawei.com> (raw)
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().
Fixes: a3437870160c ("hugetlb: new sysfs interface")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: <stable@vger.kernel.org>
---
mm/hugetlb.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e249bffa0e75..91a2a2025a2c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2947,8 +2947,10 @@ 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;
}
--
2.19.1
next reply other threads:[~2021-01-07 12:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 12:32 Miaohe Lin [this message]
2021-01-07 19:59 ` Mike Kravetz
2021-01-07 23:15 ` Andrew Morton
2021-01-08 1:41 ` Miaohe Lin
2021-01-09 4:36 ` Muchun Song
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