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From: Hugo Villeneuve <hugo@hugovil.com>
To: gregkh@linuxfoundation.org,
	jirislaby@kernel.org,
	cosmin.tanislav@analog.com,
	andy.shevchenko@gmail.com,
	shc_work@mail.ru
Cc: linux-kernel@vger.kernel.org,
	linux-serial@vger.kernel.org,
	hugo@hugovil.com,
	Hugo Villeneuve <hvilleneuve@dimonoff.com>,
	stable@vger.kernel.org
Date: Wed, 17 Jan 2024 17:38:39 -0500
Message-Id: <20240117223856.2303475-2-hugo@hugovil.com>
In-Reply-To: <20240117223856.2303475-1-hugo@hugovil.com>
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Subject: [PATCH 01/18] serial: max310x: fix NULL pointer dereference in I2C instantiation

From: Hugo Villeneuve <hvilleneuve@dimonoff.com>

When trying to instantiate a max14830 device from userspace:

    echo max14830 0x60 > /sys/bus/i2c/devices/i2c-2/new_device

we get the following error:

    Unable to handle kernel NULL pointer dereference at virtual address...
    ...
    Call trace:
        max310x_i2c_probe+0x48/0x170 [max310x]
        i2c_device_probe+0x150/0x2a0
    ...

Add check for validity of devtype to prevent the error, and abort probe
with a meaningful error message.

Fixes: 2e1f2d9a9bdb ("serial: max310x: implement I2C support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
---
 drivers/tty/serial/max310x.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index f3a99daebdaa..4a33fd950ed2 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1602,13 +1602,16 @@ static unsigned short max310x_i2c_slave_addr(unsigned short addr,
 
 static int max310x_i2c_probe(struct i2c_client *client)
 {
-	const struct max310x_devtype *devtype =
-			device_get_match_data(&client->dev);
+	const struct max310x_devtype *devtype;
 	struct i2c_client *port_client;
 	struct regmap *regmaps[4];
 	unsigned int i;
 	u8 port_addr;
 
+	devtype = device_get_match_data(&client->dev);
+	if (!devtype)
+		return dev_err_probe(&client->dev, -ENODEV, "Failed to match device\n");
+
 	if (client->addr < devtype->slave_addr.min ||
 		client->addr > devtype->slave_addr.max)
 		return dev_err_probe(&client->dev, -EINVAL,
-- 
2.39.2