[PATCH v3 04/10] iio: at91-sama5d2_adc: Fix unsafe buffer attributes

[Jonathan Cameron]

On Thu, 6 Oct 2022 08:34:17 +0000
<Claudiu.Beznea at microchip.com> wrote:

> On 03.10.2022 11:11, Matti Vaittinen wrote:
> > The iio_triggered_buffer_setup_ext() was changed by
> > commit 15097c7a1adc ("iio: buffer: wrap all buffer attributes into iio_dev_attr")
> > to silently expect that all attributes given in buffer_attrs array are
> > device-attributes. This expectation was not forced by the API - and some
> > drivers did register attributes created by IIO_CONST_ATTR().
> > 
> > The added attribute "wrapping" does not copy the pointer to stored
> > string constant and when the sysfs file is read the kernel will access
> > to invalid location.
> > 
> > Change the IIO_CONST_ATTRs from the driver to IIO_DEVICE_ATTR in order
> > to prevent the invalid memory access.
> > 
> > Signed-off-by: Matti Vaittinen <mazziesaccount at gmail.com>
> > Fixes: 15097c7a1adc ("iio: buffer: wrap all buffer attributes into iio_dev_attr")  
> 
> Tested-by: Claudiu Beznea <claudiu.beznea at microchip.com>
> 
> on SAMA5D2
> 
Applied to the fixes-togreg branch of iio.git and marked for stable.

For the reset of the series I'll need to wait for these first 4 patches to make their
way to upstream of the togreg branch then queue the rest up on top of that.

Jonathan

>