Messages in this thread Patch in this message | | | From | Krzysztof Kozlowski <> | Subject | [PATCH 7/7] mfd: max8998: Fix possible NULL pointer dereference on i2c_new_dummy error | Date | Tue, 11 Feb 2014 11:03:35 +0100 |
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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.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Cc: stable@vger.kernel.org --- drivers/mfd/max8998.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c index 612ca404e150..61ea1826f8b4 100644 --- a/drivers/mfd/max8998.c +++ b/drivers/mfd/max8998.c @@ -215,6 +215,10 @@ static int max8998_i2c_probe(struct i2c_client *i2c, mutex_init(&max8998->iolock); max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR); + if (!max8998->rtc) { + dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n"); + return -ENODEV; + } i2c_set_clientdata(max8998->rtc, max8998); max8998_irq_init(max8998); -- 1.7.9.5
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