On 15/11/16 01:11, Song Hongyan wrote: > 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@xxxxxxxxx> Looks sensible to me. Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx> > --- > changes: update comments > > drivers/hid/hid-sensor-hub.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c > index 658a607..b74d954 100644 > --- a/drivers/hid/hid-sensor-hub.c > +++ b/drivers/hid/hid-sensor-hub.c > @@ -252,6 +252,7 @@ int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, > int report_size; > 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) || > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
