From 159ce52a6b777fc82fa0b51c7440e25f9e4c6feb Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Tue, 11 Feb 2014 11:03:29 +0100 Subject: mfd: 88pm860x: Fix possible NULL pointer dereference on i2c_new_dummy error 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. Cc: stable@vger.kernel.org Signed-off-by: Krzysztof Kozlowski Signed-off-by: Lee Jones diff --git a/drivers/mfd/88pm860x-core.c b/drivers/mfd/88pm860x-core.c index 2461014..bcfc9e8 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)) { -- cgit v0.10.2