NFSv4: Fix two infinite loops in the mount code

We can currently loop forever in nfs4_lookup_root() and in
nfs41_proc_secinfo_no_name(), if the first iteration returns a
NFS4ERR_DELAY or something else that causes exception.retry to get
set.

Reported-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 45df7d4a3acc..ee9ca19457ab 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2290,11 +2290,12 @@ static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
                 switch (err) {
                 case 0:
                 case -NFS4ERR_WRONGSEC:
-                        break;
+                        goto out;
                 default:
                         err = nfs4_handle_exception(server, err, &exception);
                 }
         } while (exception.retry);
+out:
         return err;
 }
 
@@ -6229,11 +6230,12 @@ nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
                 case 0:
                 case -NFS4ERR_WRONGSEC:
                 case -NFS4ERR_NOTSUPP:
-                        break;
+                        goto out;
                 default:
                         err = nfs4_handle_exception(server, err, &exception);
                 }
         } while (exception.retry);
+out:
         return err;
 }