From: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Date: Sun, 4 Oct 2015 16:59:45 +0000 (+0200)
Subject: sc16is7xx: null ptr check
X-Git-Tag: firefly_0821_release~176^2~803^2~43
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2b0159d1ecfbc11badb96466c0c1582ee5ffe78f;p=firefly-linux-kernel-4.4.55.git

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 c4abd7557b35..1ae8aa698fcb 100644
--- 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;