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User namespaces: Only put the userns when we unhash the uid
uids in namespaces other than init don't get a sysfs entry. For those in the init namespace, while we're waiting to remove the sysfs entry for the uid the uid is still hashed, and alloc_uid() may re-grab that uid without getting a new reference to the user_ns, which we've already put in free_user before scheduling remove_user_sysfs_dir(). Reported-and-tested-by: KOSAKI Motohiro <email@example.com> Signed-off-by: Serge E. Hallyn <firstname.lastname@example.org> Acked-by: David Howells <email@example.com> Tested-by: Ingo Molnar <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>
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