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 <k.kozlowski@samsung.com> Acked-by: Beomho Seo <beomho.seo@samsung.com> Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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2076a20fc1
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d0a588a57c
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@ -652,7 +652,19 @@ static int cm36651_probe(struct i2c_client *client,
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cm36651->client = client;
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cm36651->ps_client = i2c_new_dummy(client->adapter,
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CM36651_I2C_ADDR_PS);
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if (!cm36651->ps_client) {
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dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
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ret = -ENODEV;
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goto error_disable_reg;
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}
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cm36651->ara_client = i2c_new_dummy(client->adapter, CM36651_ARA);
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if (!cm36651->ara_client) {
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dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
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ret = -ENODEV;
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goto error_i2c_unregister_ps;
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}
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mutex_init(&cm36651->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->channels = cm36651_channels;
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@ -664,7 +676,7 @@ static int cm36651_probe(struct i2c_client *client,
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ret = cm36651_setup_reg(cm36651);
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if (ret) {
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dev_err(&client->dev, "%s: register setup failed\n", __func__);
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goto error_disable_reg;
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goto error_i2c_unregister_ara;
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}
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ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
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@ -672,7 +684,7 @@ static int cm36651_probe(struct i2c_client *client,
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"cm36651", indio_dev);
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if (ret) {
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dev_err(&client->dev, "%s: request irq failed\n", __func__);
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goto error_disable_reg;
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goto error_i2c_unregister_ara;
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}
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ret = iio_device_register(indio_dev);
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@ -685,6 +697,10 @@ static int cm36651_probe(struct i2c_client *client,
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error_free_irq:
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free_irq(client->irq, indio_dev);
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error_i2c_unregister_ara:
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i2c_unregister_device(cm36651->ara_client);
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error_i2c_unregister_ps:
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i2c_unregister_device(cm36651->ps_client);
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error_disable_reg:
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regulator_disable(cm36651->vled_reg);
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return ret;
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@ -698,6 +714,8 @@ static int cm36651_remove(struct i2c_client *client)
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iio_device_unregister(indio_dev);
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regulator_disable(cm36651->vled_reg);
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free_irq(client->irq, indio_dev);
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i2c_unregister_device(cm36651->ps_client);
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i2c_unregister_device(cm36651->ara_client);
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return 0;
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}
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