iio: gts-helper: add __counted_by_ptr to struct iio_gts

The compiler attribute __counted_by_ptr can be used by KASAN and UBSAN
to detect out-of-bounds accesses to pointer fields in structs where a
corresponding element count field is available.

In "struct iio_gts", there are multiple pointer fields associated with
an element count. This patch annotates these pointer fields with
"__counted_by_ptr" to improve runtime safety:

- 'hwgain_table': counted by 'num_hwgain'
- 'itime_table': counted by 'num_itime'
- 'per_time_avail_scale_tables': counted by 'num_itime'
- 'avail_all_scales_table': counted by 'num_avail_all_scales'
- 'avail_time_tables': counted by 'num_avail_time_tables'

To ensure that the count is set correctly before any pointer is
accessed or assigned, we update "iio_init_iio_gts()" to set the counts
prior to assigning the pointers.

Cc: codemender-patching+linux@google.com
Assisted-by: LLM
Signed-off-by: Bill Wendling <morbo@google.com>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions