Phonet: reject unsupported sendmsg/recvmsg flags

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 1 deletions

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 72db27e3fc06..360cf377693e 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -860,7 +860,9 @@ static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
         int flags = msg->msg_flags;
         int err, done;
 
-        if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
+        if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
+                                MSG_CMSG_COMPAT)) ||
+                        !(msg->msg_flags & MSG_EOR))
                 return -EOPNOTSUPP;
 
         skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
@@ -981,6 +983,10 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
         struct sk_buff *skb;
         int err;
 
+        if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
+                        MSG_NOSIGNAL|MSG_CMSG_COMPAT))
+                return -EOPNOTSUPP;
+
         if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
                 return -ENOTCONN;
 
@@ -988,6 +994,8 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
                 /* Dequeue and acknowledge control request */
                 struct pep_sock *pn = pep_sk(sk);
 
+                if (flags & MSG_PEEK)
+                        return -EOPNOTSUPP;
                 skb = skb_dequeue(&pn->ctrlreq_queue);
                 if (skb) {
                         pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,