diff options
| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-02-24 12:07:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-24 13:38:32 -0800 |
| commit | 1d88433bb00853bed0c776b6ad9156855c127da0 (patch) | |
| tree | bb18ee45ffd9f622b81af7f0c2c2fefb715418da /crypto/fcrypt.c | |
| parent | c78a7f3639932c48b4e1d329fc80fd26aa1a2fa3 (diff) | |
mm/hugetlb: fix use after free when subpool max_hpages accounting is not enabled
If a hugetlbfs filesystem is created with the min_size option and
without the size option, used_hpages is always 0 and might lead to
release subpool prematurely because it indicates no pages are used now
while there might be.
In order to fix this issue, we should check used_hpages == 0 iff
max_hpages accounting is enabled. As max_hpages accounting should be
enabled in most common case, this is not worth a Cc stable.
[mike.kravetz@oracle.com: new changelog]
Link: https://lkml.kernel.org/r/20210126115510.53374-1-linmiaohe@huawei.com
Signed-off-by: Hongxiang Lou <louhongxiang@huawei.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/fcrypt.c')
0 files changed, 0 insertions, 0 deletions