--- zzzz-none-000/linux-3.10.107/net/sunrpc/auth_null.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/net/sunrpc/auth_null.c	2021-02-04 17:41:59.000000000 +0000
@@ -10,7 +10,7 @@
 #include <linux/module.h>
 #include <linux/sunrpc/clnt.h>
 
-#ifdef RPC_DEBUG
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 # define RPCDBG_FACILITY	RPCDBG_AUTH
 #endif
 
@@ -18,7 +18,7 @@
 static struct rpc_cred null_cred;
 
 static struct rpc_auth *
-nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
+nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
 {
 	atomic_inc(&null_auth.au_count);
 	return &null_auth;
@@ -35,6 +35,8 @@
 static struct rpc_cred *
 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
 {
+	if (flags & RPCAUTH_LOOKUP_RCU)
+		return &null_cred;
 	return get_rpccred(&null_cred);
 }
 
@@ -88,13 +90,13 @@
 	flavor = ntohl(*p++);
 	if (flavor != RPC_AUTH_NULL) {
 		printk("RPC: bad verf flavor: %u\n", flavor);
-		return NULL;
+		return ERR_PTR(-EIO);
 	}
 
 	size = ntohl(*p++);
 	if (size != 0) {
 		printk("RPC: bad verf size: %u\n", size);
-		return NULL;
+		return ERR_PTR(-EIO);
 	}
 
 	return p;
@@ -136,7 +138,7 @@
 	.cr_ops		= &null_credops,
 	.cr_count	= ATOMIC_INIT(1),
 	.cr_flags	= 1UL << RPCAUTH_CRED_UPTODATE,
-#ifdef RPC_DEBUG
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 	.cr_magic	= RPCAUTH_CRED_MAGIC,
 #endif
 };