CVE-2025-39688

In the Linux kernel, the following vulnerability has been resolved:

nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()

The pynfs DELEG8 test fails when run against nfsd. It acquires a

delegation and then lets the lease time out. It then tries to use the

deleg stateid and expects to see NFS4ERR_DELEG_REVOKED, but it gets

bad NFS4ERR_BAD_STATEID instead.

When a delegation is revoked, it's initially marked with

SC_STATUS_REVOKED, or SC_STATUS_ADMIN_REVOKED and later, it's marked

with the SC_STATUS_FREEABLE flag, which denotes that it is waiting for

s FREE_STATEID call.

nfs4_lookup_stateid() accepts a statusmask that includes the status

flags that a found stateid is allowed to have. Currently, that mask

never includes SC_STATUS_FREEABLE, which means that revoked delegations

are (almost) never found.

Add SC_STATUS_FREEABLE to the always-allowed status flags, and remove it

from nfsd4_delegreturn() since it's now always implied.