nfsd: fix year-2038 nfs4 state problem

Someone with a weird time_t happened to notice this, it shouldn't really
manifest till 2038.  It may not be our ownly year-2038 problem.

Reported-by: Aaron Pace <Aaron.Pace@alcatel-lucent.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f924f0618cb5..1f4b85b15125 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1508,7 +1508,12 @@ unhash_session(struct nfsd4_session *ses)
 static int
 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
 {
-        if (clid->cl_boot == nn->boot_time)
+        /*
+         * We're assuming the clid was not given out from a boot
+         * precisely 2^32 (about 136 years) before this one.  That seems
+         * a safe assumption:
+         */
+        if (clid->cl_boot == (u32)nn->boot_time)
                 return 0;
         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
                 clid->cl_boot, clid->cl_id, nn->boot_time);