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Commit cfc9fde0 authored by Maxim Patlasov's avatar Maxim Patlasov Committed by Miklos Szeredi
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ovl: verify upper dentry in ovl_remove_and_whiteout()



The upper dentry may become stale before we call ovl_lock_rename_workdir.
For example, someone could (mistakenly or maliciously) manually unlink(2)
it directly from upperdir.

To ensure it is not stale, let's lookup it after ovl_lock_rename_workdir
and and check if it matches the upper dentry.

Essentially, it is the same problem and similar solution as in
commit 11f37104 ("ovl: verify upper dentry before unlink and rename").

Signed-off-by: default avatarMaxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org>
parent 07a2daab
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