NFSv4: Fix two infinite loops in the mount code

commit 05e9cfb408b24debb3a85fd98edbfd09dd148881 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c9e2d9e..6db0972 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2242,11 +2242,12 @@ 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;
 }
 
@@ -6099,11 +6100,12 @@ 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;
 }