From 1a308118c238c5aa0af3d303b42fa6bbee279394 Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Sat, 12 May 2012 21:32:30 -0400 Subject: [PATCH] nfsd4: allow an EXCHANGE_ID to kill a 4.0 client Following rfc 5661 section 2.4.1, we can permit a 4.1 client to remove an established 4.0 client's state. (But we don't allow updates.) Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4state.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index f372a6edef34..c88f5c103e87 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1553,8 +1553,10 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, conf = find_confirmed_client_by_str(dname, strhashval); if (conf) { if (!clp_used_exchangeid(conf)) { - status = nfserr_clid_inuse; /* XXX: ? */ - goto out; + if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { + status = nfserr_inval; /* buggy client */ + goto out; + } } if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { /* 18.35.4 case 9 */ @@ -1574,6 +1576,10 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, expire_client(conf); goto out_new; } + if (!clp_used_exchangeid(conf)) { + status = nfserr_inval; + goto out; + } /* * Set bit when the owner id and verifier map to an already * confirmed client id (18.35.3). -- 2.34.1