[PATCH 5.13 039/351] leds: tlc591xx: fix return value check in tlc591xx_probe()

Greg Kroah-Hartman
2021-07-19T17:22:35Z

From: Yang Yingliang <yangyingliang@huawei.com>

[ Upstream commit ee522bcf026ec82ada793979c3a906274430595a ]

After device_get_match_data(), tlc591xx is not checked, add
check for it and also check np after dev_of_node.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/leds/leds-tlc591xx.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
index 5b9dfdf743ec..cb7bd1353f9f 100644
--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -148,16 +148,20 @@ static int
tlc591xx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- struct device_node *np = dev_of_node(&client->dev), *child;
+ struct device_node *np, *child;
struct device *dev = &client->dev;
const struct tlc591xx *tlc591xx;
struct tlc591xx_priv *priv;
int err, count, reg;

- tlc591xx = device_get_match_data(dev);
+ np = dev_of_node(dev);
if (!np)
return -ENODEV;

+ tlc591xx = device_get_match_data(dev);
+ if (!tlc591xx)
+ return -ENODEV;
+
count = of_get_available_child_count(np);
if (!count || count > tlc591xx->max_leds)
return -EINVAL;
--
2.30.2