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| author |   Bui Quang Minh <minhquangbui99@gmail.com> | 2021-11-19 16:43:40 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-20 10:35:54 -0800 |
| commit | afe041c2d0febd83698b8b0164e6b3b1dfae0b66 (patch) | |
| tree | 9f594be76a840658faf441faa4bb8cdeb48211b7 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag (diff) | |
| download | linux-dev-afe041c2d0febd83698b8b0164e6b3b1dfae0b66.tar.xz linux-dev-afe041c2d0febd83698b8b0164e6b3b1dfae0b66.zip | |
hugetlb: fix hugetlb cgroup refcounting during mremap
When hugetlb_vm_op_open() is called during copy_vma(), we may take the
reference to resv_map->css. Later, when clearing the reservation
pointer of old_vma after transferring it to new_vma, we forget to drop
the reference to resv_map->css. This leads to a reference leak of css.
Fixes this by adding a check to drop reservation css reference in
clear_vma_resv_huge_pages()
Link: https://lkml.kernel.org/r/20211113154412.91134-1-minhquangbui99@gmail.com
Fixes: 550a7d60bd5e35 ("mm, hugepages: add mremap() support for hugepage backed vma")
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions