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| author | Matti Vaittinen <mazziesaccount@gmail.com> | 2022-10-03 11:11:12 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-10-17 10:51:26 +0300 |
| commit | a10a0f385ab8af08ddb762ac3eca11e1b6d1fe69 (patch) | |
| tree | 6fb981d121842bbc8f5293c5fee1fd0787ba54cd /drivers/iio/accel/bmc150-accel-core.c | |
| parent | 5e23b33d1e84f04c80da6f1d89cbb3d3a3f81e01 (diff) | |
| download | linux-a10a0f385ab8af08ddb762ac3eca11e1b6d1fe69.tar.xz | |
iio: bmc150-accel-core: Fix unsafe buffer attributes
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@gmail.com>
Fixes: 15097c7a1adc ("iio: buffer: wrap all buffer attributes into iio_dev_attr")
Link: https://lore.kernel.org/r/cf8a56658fc38db8bed64f456d898f5ad5a2814f.1664782676.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/accel/bmc150-accel-core.c')
| -rw-r--r-- | drivers/iio/accel/bmc150-accel-core.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c index 57e8a8350cd1..92f8b139acce 100644 --- a/drivers/iio/accel/bmc150-accel-core.c +++ b/drivers/iio/accel/bmc150-accel-core.c @@ -925,17 +925,30 @@ static const struct iio_chan_spec_ext_info bmc150_accel_ext_info[] = { { } }; -static IIO_CONST_ATTR(hwfifo_watermark_min, "1"); -static IIO_CONST_ATTR(hwfifo_watermark_max, - __stringify(BMC150_ACCEL_FIFO_LENGTH)); +static ssize_t hwfifo_watermark_min_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%s\n", "1"); +} + +static ssize_t hwfifo_watermark_max_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%s\n", __stringify(BMC150_ACCEL_FIFO_LENGTH)); +} + +static IIO_DEVICE_ATTR_RO(hwfifo_watermark_min, 0); +static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0); static IIO_DEVICE_ATTR(hwfifo_enabled, S_IRUGO, bmc150_accel_get_fifo_state, NULL, 0); static IIO_DEVICE_ATTR(hwfifo_watermark, S_IRUGO, bmc150_accel_get_fifo_watermark, NULL, 0); static const struct attribute *bmc150_accel_fifo_attributes[] = { - &iio_const_attr_hwfifo_watermark_min.dev_attr.attr, - &iio_const_attr_hwfifo_watermark_max.dev_attr.attr, + &iio_dev_attr_hwfifo_watermark_min.dev_attr.attr, + &iio_dev_attr_hwfifo_watermark_max.dev_attr.attr, &iio_dev_attr_hwfifo_watermark.dev_attr.attr, &iio_dev_attr_hwfifo_enabled.dev_attr.attr, NULL, |