vfs: umount_tree() might be called on subtree that had never made it
authorAl Viro <viro@zeniv.linux.org.uk>
Wed, 30 May 2012 02:03:48 +0000 (22:03 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 9 Jun 2012 15:36:12 +0000 (00:36 +0900)
commit15de0eade174f9aade57a4080f1bac1a36e45e83
tree3351b21436f75bbd3cfc83cfde55cff18da3384f
parent75df3ae2060eb00b909ac65fc4d2798c4e53969a
vfs: umount_tree() might be called on subtree that had never made it

commit 63d37a84ab6004c235314ffd7a76c5eb28c2fae0 upstream.

__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...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/namespace.c