NFS: Update MNT and MNT3 reply decoding functions

Solder xdr_stream-based XDR decoding functions into the in-kernel mountd
client that are more careful about checking data types and watching for
buffer overflows.  The new MNT3 decoder includes support for auth-flavor
list decoding.

The "_sz" macro for MNT3 replies was missing the size of the file handle.
I've added this back, and included the size of the auth flavor array.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 539a61a0887b..0b72357cdc41 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1380,6 +1380,7 @@ out_security_failure:
 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
                          struct nfs_fh *root_fh)
 {
+        unsigned int auth_flavor_len = 0;
         struct nfs_mount_request request = {
                 .sap            = (struct sockaddr *)
                                                 &args->mount_server.address,
@@ -1387,6 +1388,7 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
                 .protocol       = args->mount_server.protocol,
                 .fh             = root_fh,
                 .noresvport     = args->flags & NFS_MOUNT_NORESVPORT,
+                .auth_flav_len  = &auth_flavor_len,
         };
         int status;