diff options
| author | Song Hongyan <hongyan.song@intel.com> | 2016-11-15 01:11:10 +0000 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2016-11-23 17:54:58 +0100 |
| commit | d443a0aa3a291e5f78072f2fa464e03bc83fafad (patch) | |
| tree | 0d0f03b4fa011cb61fd89f92bdaf072a648293db | |
| parent | 6dab07df555b652d8d989348b2ce04498d7f9a70 (diff) | |
| download | linux-kexec-d443a0aa3a291e5f78072f2fa464e03bc83fafad.tar.gz | |
HID: hid-sensor-hub: clear memory to avoid random data
When user tried to read some fields like hysteresis from IIO sysfs on some
systems, it fails. The reason is that this field is a byte field and caller
of sensor_hub_get_feature() passes a buffer of 4 bytes. Here the function
sensor_hub_get_feature() copies the single byte from the report to the
caller buffer and returns "1" as the number of bytes copied. So caller
can use the return value.
But this is done by multiple callers, so if we just change the
sensor_hub_get_feature so that caller buffer is initialized with 0s
then we don't to change all functions.
Signed-off-by: Song Hongyan <hongyan.song@intel.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| -rw-r--r-- | drivers/hid/hid-sensor-hub.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c index c5c3d611172995..60875625cbdff4 100644 --- a/drivers/hid/hid-sensor-hub.c +++ b/drivers/hid/hid-sensor-hub.c @@ -212,6 +212,7 @@ int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, __s32 value; int ret = 0; + memset(buffer, 0, buffer_size); mutex_lock(&data->mutex); report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); if (!report || (field_index >= report->maxfield)) { |