linux-kernel - [PATCH v2] mfd: wm831x: add null check before pointer dereference

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Message-ID: <20170524092623.GA7771@embeddedgus>
Date:   Wed, 24 May 2017 04:26:23 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Lee Jones <lee.jones@...aro.org>,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:     patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH v2] mfd: wm831x: add null check before pointer dereference

Add NULL check before dereferencing pointer of_id in order to avoid
a potential NULL pointer dereference.

Addresses-Coverity-ID: 1408829
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
Changes in v2:
 Update error log and return value.

 drivers/mfd/wm831x-i2c.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
index 781af06..bed66d8 100644
--- a/drivers/mfd/wm831x-i2c.c
+++ b/drivers/mfd/wm831x-i2c.c
@@ -37,6 +37,10 @@ static int wm831x_i2c_probe(struct i2c_client *i2c,
 
 	if (i2c->dev.of_node) {
 		of_id = of_match_device(wm831x_of_match, &i2c->dev);
+		if (!of_id) {
+			dev_err(&i2c->dev, "Failed to match device\n");
+			return -ENODEV;
+		}
 		type = (enum wm831x_parent)of_id->data;
 	} else {
 		type = (enum wm831x_parent)id->driver_data;
-- 
2.5.0