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| author | Vasily Averin <vvs@parallels.com> | 2014-07-21 12:30:23 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-31 12:52:56 -0700 |
| commit | 9b32e18d7ba2838991794893f10bf48805ef01ce (patch) | |
| tree | 98119130cf53d9dcadbc85518959b07aebc8c44a /fs | |
| parent | 5b5897f0c11132a9b42ffbee8f93c71ab9504300 (diff) | |
| download | renesas_kernel-9b32e18d7ba2838991794893f10bf48805ef01ce.tar.gz renesas_kernel-9b32e18d7ba2838991794893f10bf48805ef01ce.tar.bz2 renesas_kernel-9b32e18d7ba2838991794893f10bf48805ef01ce.zip | |
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>
Diffstat (limited to 'fs')
| -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 8274c8d39b0..bdea10963aa 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2247,9 +2247,10 @@ 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: |