Re: Revert e0922e5e3ccb78aa0152e93dfbd1755ac39c8582

From: Jonathan Cameron
Date: Sat Feb 14 2015 - 06:34:49 EST

On 12/02/15 20:23, Andrey Smirnov wrote:
> Hi Jonathan,
> Please revert patch e0922e5e3ccb78aa0152e93dfbd1755ac39c8582:
> It incorrectly assumes that the level of indirection is not needed
> which is not true(probably because the driver incorrectly allocates
> sizeof(*client) instead of sizeof(*data) via devm_iio_device_alloc).
> If you look at the code of the probe function(see below) it is easy to
> see that what is being stored in the private memory of the IIO device
> instance is not a copy of a 'struct i2c_client' but a pointer to an
> instance passed as an argument to the probe function.
> struct i2c_client **data;
> int ret;
> < Some code skipped >
> indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*client));
> if (!indio_dev)
> return -ENOMEM;
> data = iio_priv(indio_dev);
> *data = client;
> Without reverting this change any read of a raw value of this sensor
> leads to a kernel oops due to a NULL pointer de-reference on my
> hardware setup.
> I will be sending a patch to fix the 'sizeof' mixup shortly.
> Thank you,
> Andrey Smirnov
Reverted in the fixes-togreg branch and cc'd to stable.

I'll pick up the fix as well in a minute.

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