nfsd: check for use of the closed special stateid

[ Upstream commit ae254dac721d44c0bfebe2795df87459e2e88219 ]

Prevent the use of the closed (invalid) special stateid by clients.

Signed-off-by: Andrew Elble <aweits@rit.edu>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 2711661..65515df 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -72,6 +72,7 @@ static u64 current_sessionid = 1;
 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
+#define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
 
 /* forward declarations */
 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
@@ -4704,7 +4705,8 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
        struct nfs4_stid *s;
        __be32 status = nfserr_bad_stateid;
 
-       if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+       if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
+               CLOSE_STATEID(stateid))
                return status;
        /* Client debugging aid. */
        if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
@@ -4762,7 +4764,8 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
        else if (typemask & NFS4_DELEG_STID)
                typemask |= NFS4_REVOKED_DELEG_STID;
 
-       if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+       if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
+               CLOSE_STATEID(stateid))
                return nfserr_bad_stateid;
        status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
        if (status == nfserr_stale_clientid) {