If a server doesn't provide a service the port lookup will return 0.
Check for this, return an appropriate error code and give a hint as to
why this might be happening.
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@xxxxxxxxxx>
---
Changes v1 -> v2:
- Added error message
---
fs/nfs.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/nfs.c b/fs/nfs.c
index 446d0f7946..1a0b28442d 100644
--- a/fs/nfs.c
+++ b/fs/nfs.c
@@ -571,6 +571,12 @@ static int rpc_lookup_req(struct nfs_priv *npriv, uint32_t prog, uint32_t ver)
nfs_free_packet(nfs_packet);
+ if (port == 0) {
+ pr_warn("No UDP port for RPC program %i! "
+ "Is your NFS server TCP only?\n", prog);
+ return -ENOENT;
+ }
+
return port;
}
--
2.39.1
