diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 56d074a6cb31..73e717609213 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -3282,7 +3282,7 @@ int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
 void warn_on_nonidempotent_op(struct nfsd4_op *op)
 {
 	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
-		pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
+		pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
 			op->opnum, nfsd4_op_name(op->opnum));
 		WARN_ON_ONCE(1);
 	}
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 777b11810e95..a3cfc1d071a6 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2419,9 +2419,8 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 		op = &argp->ops[i];
 		op->replay = NULL;
 
-		READ_BUF(4);
-		op->opnum = be32_to_cpup(p++);
-
+		if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
+			return nfserr_bad_xdr;
 		if (nfsd4_opnum_in_range(argp, op)) {
 			op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
 			if (op->status != nfs_ok)
@@ -5378,7 +5377,7 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
 	if (op->status && opdesc &&
 			!(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
 		goto status;
-	BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
+	BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
 	       !nfsd4_enc_ops[op->opnum]);
 	encoder = nfsd4_enc_ops[op->opnum];
 	op->status = encoder(resp, op->status, &op->u);
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index facc5762bf83..2c31f3a7d7c7 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -615,7 +615,7 @@ struct nfsd4_copy_notify {
 };
 
 struct nfsd4_op {
-	int					opnum;
+	u32					opnum;
 	const struct nfsd4_operation *		opdesc;
 	__be32					status;
 	union nfsd4_op_u {