[PATCH v2 2/2] j1939: check supported recv*() flags

[Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>]

Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
 net/can/j1939/socket.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index 5572fdc7b67c..cb517b94373e 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -630,6 +630,9 @@ static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg,
 	struct j1939_sk_buff_cb *skcb;
 	int ret = 0;
 
+	if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE))
+		return -EINVAL;
+
 	if (flags & MSG_ERRQUEUE)
 		return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939,
 					  SCM_J1939_RECVERR);
-- 
2.20.1