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| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2014-02-11 11:03:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-06 07:55:27 -0700 |
| commit | da0bc89767da7817dc6df9cfa10321b40ffdf210 (patch) | |
| tree | ff52954dd52f30ff23bd2944e39a60fc00121170 | |
| parent | aea2ad9c6196b0adb3d863e4bcc2f74c4d57e7c2 (diff) | |
| download | lwn-da0bc89767da7817dc6df9cfa10321b40ffdf210.tar.gz lwn-da0bc89767da7817dc6df9cfa10321b40ffdf210.zip | |
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 <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/mfd/88pm860x-core.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mfd/88pm860x-core.c b/drivers/mfd/88pm860x-core.c index 31ca55548ef9..c270d0b268ad 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)) { |