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serial: max310x: Fix to avoid potential NULL pointer dereference

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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>
This commit is contained in:
Aditya Pakki 2019-03-18 18:44:14 -05:00 • committed by Greg Kroah-Hartman
parent 2e7c2f25e9
commit 7124c71944
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/max310x.c
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@ -1306,6 +1306,8 @@ 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 {