usb: phy: phy-mxs-usb: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index 4d863ebc117c..b7536af777ab 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -452,10 +452,13 @@ static int mxs_phy_probe(struct platform_device *pdev)
         struct clk *clk;
         struct mxs_phy *mxs_phy;
         int ret;
-        const struct of_device_id *of_id =
-                        of_match_device(mxs_phy_dt_ids, &pdev->dev);
+        const struct of_device_id *of_id;
         struct device_node *np = pdev->dev.of_node;
 
+        of_id = of_match_device(mxs_phy_dt_ids, &pdev->dev);
+        if (!of_id)
+                return -ENODEV;
+
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         base = devm_ioremap_resource(&pdev->dev, res);
         if (IS_ERR(base))