linux-kernel - [PATCH AUTOSEL 4.9 29/29] leds: pca9532: fix a potential NULL pointer dereference

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Date:   Mon, 22 Apr 2019 15:48:48 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kangjie Lu <kjlu@....edu>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Sasha Levin <sashal@...nel.org>, linux-leds@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 29/29] leds: pca9532: fix a potential NULL pointer dereference

From: Kangjie Lu <kjlu@....edu>

[ Upstream commit 0aab8e4df4702b31314a27ec4b0631dfad0fae0a ]

In case of_match_device cannot find a match, return -EINVAL to avoid
NULL pointer dereference.

Fixes: fa4191a609f2 ("leds: pca9532: Add device tree support")
Signed-off-by: Kangjie Lu <kjlu@....edu>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 drivers/leds/leds-pca9532.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c
index 09a7cffbc46f..896b38f6f9c0 100644
--- a/drivers/leds/leds-pca9532.c
+++ b/drivers/leds/leds-pca9532.c
@@ -488,6 +488,7 @@ static int pca9532_probe(struct i2c_client *client,
 	const struct i2c_device_id *id)
 {
 	int devid;
+	const struct of_device_id *of_id;
 	struct pca9532_data *data = i2c_get_clientdata(client);
 	struct pca9532_platform_data *pca9532_pdata =
 			dev_get_platdata(&client->dev);
@@ -503,8 +504,11 @@ static int pca9532_probe(struct i2c_client *client,
 			dev_err(&client->dev, "no platform data\n");
 			return -EINVAL;
 		}
-		devid = (int)(uintptr_t)of_match_device(
-			of_pca9532_leds_match, &client->dev)->data;
+		of_id = of_match_device(of_pca9532_leds_match,
+				&client->dev);
+		if (unlikely(!of_id))
+			return -EINVAL;
+		devid = (int)(uintptr_t) of_id->data;
 	} else {
 		devid = id->driver_data;
 	}
-- 
2.19.1