[PATCH] fs: nfs: Error if a port is unregistered

[John Watts]

If a server doesn't provide a service the port lookup will return 0.
Check for this and return an appropriate error code.

This was tested by running NFS with UDP disabled, which seems to be
the default in Arch at least.

Signed-off-by: John Watts <contact at jookia.org>
---
 fs/nfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/nfs.c b/fs/nfs.c
index 446d0f7946..696630684e 100644
--- a/fs/nfs.c
+++ b/fs/nfs.c
@@ -571,6 +571,9 @@ static int rpc_lookup_req(struct nfs_priv *npriv, uint32_t prog, uint32_t ver)
 
 	nfs_free_packet(nfs_packet);
 
+	if (port == 0)
+		return -ENOENT;
+
 	return port;
 }
 
-- 
2.39.1