[PATCH net-next v2] net: mscc: ocelot: check return value after calling platform_get_resource()

[Yang Yingliang]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
v2:
  add missing goto err_alloc_felix
---
 drivers/net/dsa/ocelot/seville_vsc9953.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
index 84f93a874d50..deae923c8b7a 100644
--- a/drivers/net/dsa/ocelot/seville_vsc9953.c
+++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
@@ -1206,6 +1206,11 @@ static int seville_probe(struct platform_device *pdev)
 	felix->info = &seville_info_vsc9953;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		err = -EINVAL;
+		dev_err(&pdev->dev, "Invalid resource\n");
+		goto err_alloc_felix;
+	}
 	felix->switch_base = res->start;
 
 	ds = kzalloc(sizeof(struct dsa_switch), GFP_KERNEL);
-- 
2.25.1