• Trond Myklebust's avatar
    LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs · 9a1b6bf8
    Trond Myklebust authored
    Firstly, nlmclnt_setlockargs can be called from a reclaimer thread, in
    which case we're in entirely the wrong namespace.
    
    Secondly, commit 8aac6270 (move
    exit_task_namespaces() outside of exit_notify()) now means that
    exit_task_work() is called after exit_task_namespaces(), which
    triggers an Oops when we're freeing up the locks.
    
    Fix this by ensuring that we initialise the nlm_host's rpc_client at mount
    time, so that the cl_nodename field is initialised to the value of
    utsname()->nodename that the net namespace uses. Then replace the
    lockd callers of utsname()->nodename.
    Signed-off-by: 's avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    Cc: Toralf Förster <toralf.foerster@gmx.de>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Nix <nix@esperi.org.uk>
    Cc: Jeff Layton <jlayton@redhat.com>
    Cc: stable@vger.kernel.org # 3.10.x
    9a1b6bf8
clntlock.c 7.5 KB