commit 09a54f0ebfe263bc27c90bbd80187b9a93283887 upstream.

If the user specifies an open mode of 3, then we don't have a NFSv4 state
attached to the context, and so we Oops when we try to dereference it.
Reported-by: NOlga Kornievskaia <aglo@umich.edu>
Fixes: 29b59f94 ("NFSv4: change nfs4_do_setattr to take...")
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.10: 991eedb1: NFSv4: Only pass the...
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>