ubusd: fix issue caused by an implicit cast

An -1 returned by ubus_msg_writev() will be interpreted as
UINT_MAX during a check to see how much data had could be
written on the socket.

Because sizeof() will return size_t it will promote the
comparsion to unsigned

Signed-off-by: Mihai Richard <mihairichard@live.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/ubusd.c b/ubusd.c
index 7279a70..5409b7f 100644
--- a/ubusd.c
+++ b/ubusd.c
@@ -148,12 +148,13 @@ void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
 
 	if (!cl->tx_queue[cl->txq_cur]) {
 		written = ubus_msg_writev(cl->sock.fd, ub, 0);
-		if (written >= ub->len + sizeof(ub->hdr))
-			goto out;
 
 		if (written < 0)
 			written = 0;
 
+		if (written >= ub->len + sizeof(ub->hdr))
+			goto out;
+
 		cl->txq_ofs = written;
 
 		/* get an event once we can write to the socket again */