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iio:imu:mpu6050: Fixed segfault in Invensens MPU driver due to null dereference

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The driver segfaults when the kernel boots with device tree as the
platform data is then not present and the pointer is deferenced without
checking it is not null.  This patch introduces such a check avoiding the
crash.

Signed-off-by: Atilla Filiz <atilla.filiz@essensium.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: Stable@vger.kernel.org
This commit is contained in:
Atilla Filiz 2014-04-11 16:51:23 +02:00 committed by Jonathan Cameron
parent c60e5760b0
commit b9b3a41893
1 changed files with 5 additions and 2 deletions
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7
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
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@ -660,6 +660,7 @@ static int inv_mpu_probe(struct i2c_client *client,
{
struct inv_mpu6050_state *st;
struct iio_dev *indio_dev;
struct inv_mpu6050_platform_data *pdata;
int result;
if (!i2c_check_functionality(client->adapter,
@ -672,8 +673,10 @@ static int inv_mpu_probe(struct i2c_client *client,
st = iio_priv(indio_dev);
st->client = client;
st->plat_data = *(struct inv_mpu6050_platform_data
*)dev_get_platdata(&client->dev);
pdata = (struct inv_mpu6050_platform_data
*)dev_get_platdata(&client->dev);
if (pdata)
st->plat_data = *pdata;
/* power is turned on inside check chip type*/
result = inv_check_and_setup_chip(st, id);
if (result)