nfsd41: compare request's opcnt with session's maxops at nfsd4_sequence

Make sure nfs server errors out if request contains more ops
than channel allows.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
[bfields@redhat.com: use helper function]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6dbaa379c863..3196dc388578 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1724,6 +1724,13 @@ static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_sessi
         return;
 }
 
+static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
+{
+        struct nfsd4_compoundargs *args = rqstp->rq_argp;
+
+        return args->opcnt > session->se_fchannel.maxops;
+}
+
 __be32
 nfsd4_sequence(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *cstate,
@@ -1752,6 +1759,10 @@ nfsd4_sequence(struct svc_rqst *rqstp,
         if (!session)
                 goto out;
 
+        status = nfserr_too_many_ops;
+        if (nfsd4_session_too_many_ops(rqstp, session))
+                goto out;
+
         status = nfserr_badslot;
         if (seq->slotid >= session->se_fchannel.maxreqs)
                 goto out;