NFSv4.1: Handle errors correctly in nfs41_walk_client_list

Both nfs41_walk_client_list and nfs40_walk_client_list expect the
'status' variable to be set to the value -NFS4ERR_STALE_CLIENTID
if the loop fails to find a match.
The problem is that the 'pos->cl_cons_state > NFS_CS_READY' changes
the value of 'status', and sets it either to the value '0' (which
indicates success), or to the value EINTR.

Cc: stable@vger.kernel.org # 3.7.x: 7b1f1fd1842e6: NFSv4/4.1: Fix bugs in
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index c1b7a80..06e770a 100644 (file)
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -498,9 +498,10 @@ int nfs40_walk_client_list(struct nfs_client *new,
                        prev = pos;
 
                        status = nfs_wait_client_init_complete(pos);
-                       spin_lock(&nn->nfs_client_lock);
                        if (status < 0)
-                               continue;
+                               goto out;
+                       status = -NFS4ERR_STALE_CLIENTID;
+                       spin_lock(&nn->nfs_client_lock);
                }
                if (pos->cl_cons_state != NFS_CS_READY)
                        continue;
@@ -638,7 +639,8 @@ int nfs41_walk_client_list(struct nfs_client *new,
                        }
                        spin_lock(&nn->nfs_client_lock);
                        if (status < 0)
-                               continue;
+                               break;
+                       status = -NFS4ERR_STALE_CLIENTID;
                }
                if (pos->cl_cons_state != NFS_CS_READY)
                        continue;