tree 85e3bea7f6c723cb1bc1a2d0deca9bca98a83fd0
parent 1ca4b88e7de23f6f86d2009101fe42d5b9dbf3de
author Jeff Layton <jlayton@poochiereds.net> 1438253866 -0400
committer J. Bruce Fields <bfields@redhat.com> 1438374626 -0400

nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid

Currently, preprocess_stateid_op calls nfs4_check_olstateid which
verifies that the open stateid corresponds to the current filehandle in the
call by calling nfs4_check_fh.

If the stateid is a NFS4_DELEG_STID however, then no such check is done.
This could cause incorrect enforcement of permissions, because the
nfsd_permission() call in nfs4_check_file uses current the current
filehandle, but any subsequent IO operation will use the file descriptor
in the stateid.

Move the call to nfs4_check_fh into nfs4_check_file instead so that it
can be done for all stateid types.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Cc: stable@vger.kernel.org
[bfields: moved fh check to avoid NULL deref in special stateid case]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>