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Commit b9e183a1 authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Lee Jones
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mfd: max77686: Fix possible NULL pointer dereference on i2c_new_dummy error 



During probe the driver allocates dummy I2C device for RTC with
i2c_new_dummy() but it does not check the return value of this call.

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 device, fail also the probe for main
MFD driver.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 97dc4ed3

drivers/mfd/max77686.c

+4 −0
Original line number Diff line number Diff line
@@ -121,6 +121,10 @@ static int max77686_i2c_probe(struct i2c_client *i2c, 
		dev_info(max77686->dev, "device found\n");



	max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);

	if (!max77686->rtc) {

		dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");

		return -ENODEV;

	}

	i2c_set_clientdata(max77686->rtc, max77686);



	max77686_irq_init(max77686);