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| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2014-02-11 11:03:33 +0100 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2014-03-19 08:58:10 +0000 |
| commit | 96cf3dedc491d2f1f66cc26217f2b06b0c7b6797 (patch) | |
| tree | e0eeab0ffee918675b10931f3740811d27a89a06 | |
| parent | ed26f87b9f71693a1d1ee85f5e6209601505080f (diff) | |
| download | linux-96cf3dedc491d2f1f66cc26217f2b06b0c7b6797.tar.gz linux-96cf3dedc491d2f1f66cc26217f2b06b0c7b6797.tar.bz2 linux-96cf3dedc491d2f1f66cc26217f2b06b0c7b6797.zip | |
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 <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
| -rw-r--r-- | drivers/mfd/max8925-i2c.c | 9 |
1 files changed, 9 insertions, 0 deletions
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); |