1 files changed, 7 insertions, 0 deletions
diff --git a/net/can/gw.c b/net/can/gw.c
index 23a3d89cad81..37528826935e 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1139,6 +1139,13 @@ static int cgw_create_job(struct sk_buff *skb,  struct nlmsghdr *nlh,
 	if (gwj->dst.dev->type != ARPHRD_CAN)
 		goto out;
 
+	/* is sending the skb back to the incoming interface intended? */
+	if (gwj->src.dev == gwj->dst.dev &&
+	    !(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK)) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	ASSERT_RTNL();
 
 	err = cgw_register_filter(net, gwj);