Merge tag 'nfsd-4.11-2' of git://linux-nfs.org/~bfields/linux

Pull nfsd bugfix from Bruce Fields:
 "Fix a 4.11 regression that triggers a BUG() on an attempt to use an
  unsupported NFSv4 compound op"

* tag 'nfsd-4.11-2' of git://linux-nfs.org/~bfields/linux:
  nfsd: fix oops on unsupported operation

fs/nfsd/nfs4proc.c

@@ -2489,7 +2489,7 @@ bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
 
 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
 {
-	if (op->opnum == OP_ILLEGAL)
+	if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
 		return op_encode_hdr_size * sizeof(__be32);
 
 	BUG_ON(OPDESC(op)->op_rsize_bop == NULL);