linux-kernel - [PATCH 2/2] mfd: mc13xxx: fix a possible NULL dereference

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Date:	Tue, 16 Aug 2016 10:15:22 +0200
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	lee.jones@...aro.org
Cc:	linux-kernel@...r.kernel.org,
	LABBE Corentin <clabbe.montjoie@...il.com>
Subject: [PATCH 2/2] mfd: mc13xxx: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.
For fixing this problem, we use of_device_get_match_data(), this will
simplify the code a little by using a standard function for
getting the match data.

Reported-by: coverity (CID 986513)
Reported-by: coverity (CID 986514)
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/mfd/mc13xxx-i2c.c | 4 +---
 drivers/mfd/mc13xxx-spi.c | 5 +----
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/mfd/mc13xxx-i2c.c b/drivers/mfd/mc13xxx-i2c.c
index 3c00ccb..8ad7593 100644
--- a/drivers/mfd/mc13xxx-i2c.c
+++ b/drivers/mfd/mc13xxx-i2c.c
@@ -78,9 +78,7 @@ static int mc13xxx_i2c_probe(struct i2c_client *client,
 	}
 
 	if (client->dev.of_node) {
-		const struct of_device_id *of_id =
-			of_match_device(mc13xxx_dt_ids, &client->dev);
-		mc13xxx->variant = of_id->data;
+		mc13xxx->variant = of_device_get_match_data(&client->dev);
 	} else {
 		mc13xxx->variant = (const struct mc13xxx_variant *)id->driver_data;
 	}
diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c
index 6100025..3b4f5ba 100644
--- a/drivers/mfd/mc13xxx-spi.c
+++ b/drivers/mfd/mc13xxx-spi.c
@@ -155,10 +155,7 @@ static int mc13xxx_spi_probe(struct spi_device *spi)
 	}
 
 	if (spi->dev.of_node) {
-		const struct of_device_id *of_id =
-			of_match_device(mc13xxx_dt_ids, &spi->dev);
-
-		mc13xxx->variant = of_id->data;
+		mc13xxx->variant = of_device_get_match_data(&spi->dev);
 	} else {
 		const struct spi_device_id *id_entry = spi_get_device_id(spi);
 
-- 
2.7.3