[PATCH 2/2 v4] nfsd41: check the size of request

[Mi Jinlong <mijinlong@cn.fujitsu.com>]

This patch checks request's size when it consists SEQUENCE.

v4:
   delete format fixing which length exceed 80

v3:
   remove the check about only SEQUENCE operation.
   check the size immediately after find session.
   modify some function's format which length exceed 80.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
---
 fs/nfsd/nfs4state.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 72899ec..cc20587 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1763,6 +1763,14 @@ static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_sess
 	return args->opcnt > session->se_fchannel.maxops;
 }
 
+static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
+				  struct nfsd4_session *session)
+{
+	struct xdr_buf *xb = &rqstp->rq_arg;
+
+	return xb->len > session->se_fchannel.maxreq_sz;
+}
+
 __be32
 nfsd4_sequence(struct svc_rqst *rqstp,
 	       struct nfsd4_compound_state *cstate,
@@ -1795,6 +1803,10 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 	if (nfsd4_session_too_many_ops(rqstp, session))
 		goto out;
 
+	status = nfserr_req_too_big;
+	if (nfsd4_request_too_big(rqstp, session))
+		goto out;
+
 	status = nfserr_badslot;
 	if (seq->slotid >= session->se_fchannel.maxreqs)
 		goto out;
-- 
1.7.5.4