[PATCH] net: stmmac: Check NULL ptr on lvts_data in qcom_ethqos_probe()

[Ma Ke]

of_device_get_match_data() can return NULL if of_match_device failed, and
the pointer 'data' was dereferenced without checking against NULL. Add
checking of pointer 'data' in qcom_ethqos_probe().

Cc: stable at vger.kernel.org
Fixes: a7c30e62d4b8 ("net: stmmac: Add driver for Qualcomm ethqos")
Signed-off-by: Ma Ke <make24 at iscas.ac.cn>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 901a3c1959fa..f18393fe58a4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -838,6 +838,9 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 	ethqos->mac_base = stmmac_res.addr;
 
 	data = of_device_get_match_data(dev);
+	if (!data)
+		return -ENODEV;
+
 	ethqos->por = data->por;
 	ethqos->num_por = data->num_por;
 	ethqos->rgmii_config_loopback_en = data->rgmii_config_loopback_en;
-- 
2.25.1