NFS: Ensure NFSv4 SETCLIENTID send buffer is large enough

Ensure that the RPC buffer size specified for NFSv4 SETCLIENTID procedures
matches what we are encoding into the buffer.  See the definition of
struct nfs4_setclientid {} and the encode_setclientid() function.

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

2 files changed, 13 insertions, 10 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index eae46f008da7..db1ed9c46ede 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -116,10 +116,12 @@ static int nfs4_stat_to_errno(int);
 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
 #define encode_setclientid_maxsz \
                                 (op_encode_hdr_maxsz + \
-                                4 /*server->ip_addr*/ + \
-                                1 /*Netid*/ + \
-                                6 /*uaddr*/ + \
-                                6 + (NFS4_VERIFIER_SIZE >> 2))
+                                XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
+                                XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
+                                1 /* sc_prog */ + \
+                                XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
+                                XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
+                                1) /* sc_cb_ident */
 #define decode_setclientid_maxsz \
                                 (op_decode_hdr_maxsz + \
                                 2 + \
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 6b213a64b15f..d8e395d0c7c9 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -666,16 +666,17 @@ struct nfs4_rename_res {
         struct nfs_fattr *              new_fattr;
 };
 
+#define NFS4_SETCLIENTID_NAMELEN        (48)
 struct nfs4_setclientid {
-        const nfs4_verifier *           sc_verifier;      /* request */
+        const nfs4_verifier *           sc_verifier;
         unsigned int                    sc_name_len;
-        char                            sc_name[48];      /* request */
-        u32                             sc_prog;          /* request */
+        char                            sc_name[NFS4_SETCLIENTID_NAMELEN];
+        u32                             sc_prog;
         unsigned int                    sc_netid_len;
-        char                            sc_netid[4];      /* request */
+        char                            sc_netid[RPCBIND_MAXNETIDLEN];
         unsigned int                    sc_uaddr_len;
-        char                            sc_uaddr[24];     /* request */
-        u32                             sc_cb_ident;      /* request */
+        char                            sc_uaddr[RPCBIND_MAXUADDRLEN];
+        u32                             sc_cb_ident;
 };
 
 struct nfs4_statfs_arg {