diff options
| author | Vasily Averin <vvs@parallels.com> | 2014-07-21 12:30:23 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-31 12:44:08 -0700 |
| commit | 86f613bb9b10e8352d6ad6ca53ee5863c8d2fe2a (patch) | |
| tree | 50caa92b16423a76ffa554e5d37d6dc6ad01ffe7 | |
| parent | 1977b3e16fbd7db0768dabea88ca4926d409f3bd (diff) | |
fs: umount on symlink leaks mnt count
commit 295dc39d941dc2ae53d5c170365af4c9d5c16212 upstream.
Currently umount on symlink blocks following umount:
/vz is separate mount
# ls /vz/ -al | grep test
drwxr-xr-x. 2 root root 4096 Jul 19 01:14 testdir
lrwxrwxrwx. 1 root root 11 Jul 19 01:16 testlink -> /vz/testdir
# umount -l /vz/testlink
umount: /vz/testlink: not mounted (expected)
# lsof /vz
# umount /vz
umount: /vz: device is busy. (unexpected)
In this case mountpoint_last() gets an extra refcount on path->mnt
Signed-off-by: Vasily Averin <vvs@openvz.org>
Acked-by: Ian Kent <raven@themaw.net>
Acked-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/namei.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/namei.c b/fs/namei.c index 985c6f36848..9eb787e5c16 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2256,9 +2256,10 @@ done: goto out; } path->dentry = dentry; - path->mnt = mntget(nd->path.mnt); + path->mnt = nd->path.mnt; if (should_follow_link(dentry, nd->flags & LOOKUP_FOLLOW)) return 1; + mntget(path->mnt); follow_mount(path); error = 0; out: |