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vfs: umount_tree() might be called on subtree that had never made it 

__mnt_make_shortterm() in there undoes the effect of __mnt_make_longterm()
we'd done back when we set ->mnt_ns non-NULL; it should not be done to
vfsmounts that had never gone through commit_tree() and friends.  Kudos to
lczerner for catching that one...

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-05-29 22:03:48 -04:00
parent 46ce341b2f
commit 63d37a84ab
1 changed files with 2 additions and 1 deletions
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3
fs/namespace.c
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@ -1074,8 +1074,9 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
list_del_init(&p->mnt_expire);
list_del_init(&p->mnt_list);
__touch_mnt_namespace(p->mnt_ns);
if (p->mnt_ns)
__mnt_make_shortterm(p);
p->mnt_ns = NULL;
__mnt_make_shortterm(p);
list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
p->mnt_parent->mnt_ghosts++;