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gpio: max732x: Fix possible NULL pointer dereference on i2c_new_dummy error

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In max732x_probe() driver allocates dummy I2C device (if number of ports
is greater than 8) 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
dereferenced by i2c_smbus_read_byte() (called from max732x_readb()).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Krzysztof Kozlowski 2014-03-06 10:31:16 +01:00 committed by Linus Walleij
parent c75793d8ab
commit f561b4230c
1 changed files with 7 additions and 0 deletions
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7
drivers/gpio/gpio-max732x.c
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@ -622,6 +622,13 @@ static int max732x_probe(struct i2c_client *client,
goto out_failed;
}
if (nr_port > 8 && !chip->client_dummy) {
dev_err(&client->dev,
"Failed to allocate second group I2C device\n");
ret = -ENODEV;
goto out_failed;
}
mutex_init(&chip->lock);
max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]);