sc16is7xx: null ptr check

If a wrong compatible flag in specified, the of_match_device
returning null.
Implemented check and if NULL then returning -ENODEV.

Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index c4abd7557b3550bd058ba83f553e8f698189c9bb..1ae8aa698fcbd6dc80ebfae05a0a3ae0b1c6e5eb 100644 (file)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1321,6 +1321,9 @@ static int sc16is7xx_spi_probe(struct spi_device *spi)
                const struct of_device_id *of_id =
                        of_match_device(sc16is7xx_dt_ids, &spi->dev);
 
+               if (!of_id)
+                       return -ENODEV;
+
                devtype = (struct sc16is7xx_devtype *)of_id->data;
        } else {
                const struct spi_device_id *id_entry = spi_get_device_id(spi);
@@ -1380,6 +1383,9 @@ static int sc16is7xx_i2c_probe(struct i2c_client *i2c,
                const struct of_device_id *of_id =
                                of_match_device(sc16is7xx_dt_ids, &i2c->dev);
 
+               if (!of_id)
+                       return -ENODEV;
+
                devtype = (struct sc16is7xx_devtype *)of_id->data;
        } else {
                devtype = (struct sc16is7xx_devtype *)id->driver_data;