From: Krzysztof Kozlowski Date: Tue, 11 Feb 2014 10:03:29 +0000 (+0100) Subject: mfd: 88pm860x: Fix possible NULL pointer dereference on i2c_new_dummy error X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b9ca3dd22e63b9ab1f069a2b25234d55986d1054;p=karo-tx-linux.git mfd: 88pm860x: Fix possible NULL pointer dereference on i2c_new_dummy error commit 159ce52a6b777fc82fa0b51c7440e25f9e4c6feb upstream. During probe the driver allocates dummy I2C device for companion chip 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 regmap_init_i2c(). If i2c_new_dummy() fails for companion device, fail also the probe for main MFD driver. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mfd/88pm860x-core.c b/drivers/mfd/88pm860x-core.c index c9b1f6422941..e456be9a7c67 100644 --- a/drivers/mfd/88pm860x-core.c +++ b/drivers/mfd/88pm860x-core.c @@ -1179,6 +1179,11 @@ static int pm860x_probe(struct i2c_client *client, chip->companion_addr = pdata->companion_addr; chip->companion = i2c_new_dummy(chip->client->adapter, chip->companion_addr); + if (!chip->companion) { + dev_err(&client->dev, + "Failed to allocate I2C companion device\n"); + return -ENODEV; + } chip->regmap_companion = regmap_init_i2c(chip->companion, &pm860x_regmap_config); if (IS_ERR(chip->regmap_companion)) {