From 96cf3dedc491d2f1f66cc26217f2b06b0c7b6797 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Tue, 11 Feb 2014 11:03:33 +0100 Subject: [PATCH] mfd: max8925: Fix possible NULL pointer dereference on i2c_new_dummy error During probe the driver allocates dummy I2C devices for RTC and ADC with i2c_new_dummy() but it does not check the return value of this calls. In case of error (i2c_new_device(): memory allocation failure or I2C address cannot be used) this function returns NULL which is later used by i2c_unregister_device(). If i2c_new_dummy() fails for RTC or ADC devices, fail also the probe for main MFD driver. Cc: stable@vger.kernel.org Signed-off-by: Krzysztof Kozlowski Signed-off-by: Lee Jones --- drivers/mfd/max8925-i2c.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/mfd/max8925-i2c.c b/drivers/mfd/max8925-i2c.c index 176aa26fc787..a83eed5c15ca 100644 --- a/drivers/mfd/max8925-i2c.c +++ b/drivers/mfd/max8925-i2c.c @@ -181,9 +181,18 @@ static int max8925_probe(struct i2c_client *client, mutex_init(&chip->io_lock); chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR); + if (!chip->rtc) { + dev_err(chip->dev, "Failed to allocate I2C device for RTC\n"); + return -ENODEV; + } i2c_set_clientdata(chip->rtc, chip); chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR); + if (!chip->adc) { + dev_err(chip->dev, "Failed to allocate I2C device for ADC\n"); + i2c_unregister_device(chip->rtc); + return -ENODEV; + } i2c_set_clientdata(chip->adc, chip); device_init_wakeup(&client->dev, 1); -- 2.20.1