serial: max310x: Fix to avoid potential NULL pointer dereference

commit 3a10e3dd52e80b9a97a3346020024d17b2c272d6 upstream.

of_match_device can return a NULL pointer when matching device is not
found. This patch avoids a scenario causing NULL pointer derefernce.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 9dfedbe6c07188f51dbce9589b16b1dafced43f6..54660002271a1b90d02a2cf2a74734493f4ce8a2 100644 (file)
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1323,6 +1323,8 @@ static int max310x_spi_probe(struct spi_device *spi)
        if (spi->dev.of_node) {
                const struct of_device_id *of_id =
                        of_match_device(max310x_dt_ids, &spi->dev);
+               if (!of_id)
+                       return -ENODEV;
 
                devtype = (struct max310x_devtype *)of_id->data;
        } else {