Commit d443a0aa authored by Song Hongyan's avatar Song Hongyan Committed by Jiri Kosina

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: default avatarSong Hongyan <hongyan.song@intel.com>
Acked-by: default avatarJonathan Cameron <jic23@kernel.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 6dab07df
...@@ -212,6 +212,7 @@ int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, ...@@ -212,6 +212,7 @@ int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
__s32 value; __s32 value;
int ret = 0; int ret = 0;
memset(buffer, 0, buffer_size);
mutex_lock(&data->mutex); mutex_lock(&data->mutex);
report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
if (!report || (field_index >= report->maxfield)) { if (!report || (field_index >= report->maxfield)) {
......
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