net: stmmac: Add check for taprio basetime configuration

Adds a boundary check to prevent negative basetime input from user
while configuring taprio.

Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
Signed-off-by: Lai Peter Jun Ann <jun.ann.lai@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c

@@ -926,6 +926,9 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	int i, ret = 0;
 	u64 ctr;
 
+	if (qopt->base_time < 0)
+		return -ERANGE;
+
 	if (!priv->dma_cap.estsel)
 		return -EOPNOTSUPP;