mfd: wm831x-spi: Add NULL check before pointer dereference

Add NULL check before dereferencing pointer of_id in order to avoid
a potential NULL pointer dereference.

Addresses-Coverity-ID: 1408830
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
index c332e2885b26..018ce652ae57 100644
--- a/drivers/mfd/wm831x-spi.c
+++ b/drivers/mfd/wm831x-spi.c
@@ -34,6 +34,10 @@ static int wm831x_spi_probe(struct spi_device *spi)
 
         if (spi->dev.of_node) {
                 of_id = of_match_device(wm831x_of_match, &spi->dev);
+                if (!of_id) {
+                        dev_err(&spi->dev, "Failed to match device\n");
+                        return -ENODEV;
+                }
                 type = (enum wm831x_parent)of_id->data;
         } else {
                 type = (enum wm831x_parent)id->driver_data;