From d0a588a57c2b0748df8307a0865a1bbbf1624c53 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Tue, 18 Mar 2014 08:13:00 +0000 Subject: [PATCH] iio: cm36651: Fix i2c client leak and possible NULL pointer dereference During probe the driver allocates dummy I2C devices (i2c_new_dummy()) but they aren't unregistered during driver remove or probe failure. Additionally driver does not check the return value of i2c_new_dummy(). In case of error (i2c_new_device(): memory allocation failure or I2C address cannot be used) this function returns NULL which is later dereferenced by i2c_smbus_{read,write}_data() functions. Fix issues by properly checking for i2c_new_dummy() return value and unregistering I2C devices on driver remove or probe failure. Signed-off-by: Krzysztof Kozlowski Acked-by: Beomho Seo Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- drivers/iio/light/cm36651.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/drivers/iio/light/cm36651.c b/drivers/iio/light/cm36651.c index a45e07492db3..39fc67e82138 100644 --- a/drivers/iio/light/cm36651.c +++ b/drivers/iio/light/cm36651.c @@ -652,7 +652,19 @@ static int cm36651_probe(struct i2c_client *client, cm36651->client = client; cm36651->ps_client = i2c_new_dummy(client->adapter, CM36651_I2C_ADDR_PS); + if (!cm36651->ps_client) { + dev_err(&client->dev, "%s: new i2c device failed\n", __func__); + ret = -ENODEV; + goto error_disable_reg; + } + cm36651->ara_client = i2c_new_dummy(client->adapter, CM36651_ARA); + if (!cm36651->ara_client) { + dev_err(&client->dev, "%s: new i2c device failed\n", __func__); + ret = -ENODEV; + goto error_i2c_unregister_ps; + } + mutex_init(&cm36651->lock); indio_dev->dev.parent = &client->dev; indio_dev->channels = cm36651_channels; @@ -664,7 +676,7 @@ static int cm36651_probe(struct i2c_client *client, ret = cm36651_setup_reg(cm36651); if (ret) { dev_err(&client->dev, "%s: register setup failed\n", __func__); - goto error_disable_reg; + goto error_i2c_unregister_ara; } ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler, @@ -672,7 +684,7 @@ static int cm36651_probe(struct i2c_client *client, "cm36651", indio_dev); if (ret) { dev_err(&client->dev, "%s: request irq failed\n", __func__); - goto error_disable_reg; + goto error_i2c_unregister_ara; } ret = iio_device_register(indio_dev); @@ -685,6 +697,10 @@ static int cm36651_probe(struct i2c_client *client, error_free_irq: free_irq(client->irq, indio_dev); +error_i2c_unregister_ara: + i2c_unregister_device(cm36651->ara_client); +error_i2c_unregister_ps: + i2c_unregister_device(cm36651->ps_client); error_disable_reg: regulator_disable(cm36651->vled_reg); return ret; @@ -698,6 +714,8 @@ static int cm36651_remove(struct i2c_client *client) iio_device_unregister(indio_dev); regulator_disable(cm36651->vled_reg); free_irq(client->irq, indio_dev); + i2c_unregister_device(cm36651->ps_client); + i2c_unregister_device(cm36651->ara_client); return 0; } -- 2.30.2