NFSv4: A root pathname is sent as a zero component4

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 646f16da0722..1750d996f49f 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -2408,8 +2408,10 @@ static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
 
         READ_BUF(4);
         READ32(n);
-        if (n <= 0)
+        if (n < 0)
                 goto out_eio;
+        if (n == 0)
+                goto root_path;
         dprintk("path ");
         path->ncomponents = 0;
         while (path->ncomponents < n) {
@@ -2430,6 +2432,13 @@ static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
 out:
         dprintk("\n");
         return status;
+root_path:
+/* a root pathname is sent as a zero component4 */
+        path->ncomponents = 1;
+        path->components[0].len=0;
+        path->components[0].data=NULL;
+        dprintk("path /\n");
+        goto out;
 out_eio:
         dprintk(" status %d", status);
         status = -EIO;