gpio: syscon: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later at line 199:
priv->flags = of_id->data;

Reported-by: coverity (CID 1324140)
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 045a952576c708e253de29438abaec95640989f2..7b25fdf64802339967ab541bb5ecd5bb876779d7 100644 (file)
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -187,11 +187,15 @@ MODULE_DEVICE_TABLE(of, syscon_gpio_ids);
 static int syscon_gpio_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
-       const struct of_device_id *of_id = of_match_device(syscon_gpio_ids, dev);
+       const struct of_device_id *of_id;
        struct syscon_gpio_priv *priv;
        struct device_node *np = dev->of_node;
        int ret;
 
+       of_id = of_match_device(syscon_gpio_ids, dev);
+       if (!of_id)
+               return -ENODEV;
+
        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;