NFS: SETCLIENTID XDR buffer sizes are incorrect

Use the correct calculation of the maximum size of a clientaddr4
when encoding and decoding SETCLIENTID operations. clientaddr4 is
defined in section 2.2.10 of RFC3530bis-31.

The usage in encode_setclientid_maxsz is missing the 4-byte length
in both strings, but is otherwise correct. decode_setclientid_maxsz
simply asks for a page of receive buffer space, which is
unnecessarily large (more than 4KB).

Note that a SETCLIENTID reply is either clientid+verifier, or
clientaddr4, depending on the returned NFS status. It doesn't
hurt to allocate enough space for both.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 206c08a60c7f..f8afa6783fb8 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -141,13 +141,15 @@ static int nfs4_stat_to_errno(int);
                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
                                 XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
                                 1 /* sc_prog */ + \
-                                XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
-                                XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
+                                1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
+                                1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
                                 1) /* sc_cb_ident */
 #define decode_setclientid_maxsz \
                                 (op_decode_hdr_maxsz + \
-                                2 + \
-                                1024) /* large value for CLID_INUSE */
+                                2 /* clientid */ + \
+                                XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
+                                1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
+                                1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
 #define encode_setclientid_confirm_maxsz \
                                 (op_encode_hdr_maxsz + \
                                 3 + (NFS4_VERIFIER_SIZE >> 2))