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mfd: max8997: Fix possible NULL pointer dereference on i2c_new_dummy error 

commit 97dc4ed3fa377ec91bb60ba98b70d645c2099384 upstream.

During probe the driver allocates dummy I2C devices for RTC, haptic and
MUIC 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, haptic or MUIC devices, fail also the
probe for main MFD driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krzysztof Kozlowski 2014-02-11 11:03:34 +01:00 committed by Greg Kroah-Hartman
parent fe22769b21
commit e2736c784b
1 changed files with 18 additions and 0 deletions
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18
drivers/mfd/max8997.c
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@ -218,10 +218,26 @@ static int max8997_i2c_probe(struct i2c_client *i2c,
mutex_init(&max8997->iolock);
max8997->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
if (!max8997->rtc) {
dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n");
return -ENODEV;
}
i2c_set_clientdata(max8997->rtc, max8997);
max8997->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
if (!max8997->haptic) {
dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n");
ret = -ENODEV;
goto err_i2c_haptic;
}
i2c_set_clientdata(max8997->haptic, max8997);
max8997->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
if (!max8997->muic) {
dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n");
ret = -ENODEV;
goto err_i2c_muic;
}
i2c_set_clientdata(max8997->muic, max8997);
pm_runtime_set_active(max8997->dev);
@ -248,7 +264,9 @@ static int max8997_i2c_probe(struct i2c_client *i2c,
err_mfd:
mfd_remove_devices(max8997->dev);
i2c_unregister_device(max8997->muic);
err_i2c_muic:
i2c_unregister_device(max8997->haptic);
err_i2c_haptic:
i2c_unregister_device(max8997->rtc);
err:
kfree(max8997);