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| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-02-24 12:06:50 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-24 13:38:32 -0800 |
| commit | cc2205a67dec5a700227a693fc113441e73e4641 (patch) | |
| tree | eda588d8fc85b9ca03c47a80765bdc77dfad4a09 /mm/hugetlb.c | |
| parent | aba677f94b7d1004a9477464d78111d9082546f9 (diff) | |
| download | linux-cc2205a67dec5a700227a693fc113441e73e4641.tar.bz2 | |
mm/hugetlb: fix potential double free in hugetlb_register_node() error path
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: a3437870160c ("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>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 905a7d549b00..dd56e205e7ab 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -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; } |