[PATCH 2/2 v3] nfsd41: check the size of request

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

This patch checks request's size when it consists SEQUENCE.
Also modifies the format of some function 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 |   24 ++++++++++++++++++++----
 1 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e98f3c2..9cce11c 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1645,7 +1645,8 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
 	return status;
 }
 
-static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
+static bool nfsd4_compound_in_session(struct nfsd4_session *session,
+				      struct nfs4_sessionid *sid)
 {
 	if (!session)
 		return 0;
@@ -1695,7 +1696,8 @@ out:
 	return status;
 }
 
-static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
+static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt,
+					    struct nfsd4_session *s)
 {
 	struct nfsd4_conn *c;
 
@@ -1707,7 +1709,8 @@ static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_s
 	return NULL;
 }
 
-static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
+static void nfsd4_sequence_check_conn(struct nfsd4_conn *new,
+				      struct nfsd4_session *ses)
 {
 	struct nfs4_client *clp = ses->se_client;
 	struct nfsd4_conn *c;
@@ -1729,13 +1732,22 @@ 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)
+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;
 }
 
+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,
@@ -1768,6 +1780,10 @@ 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