iio: temperature: tmp006: fix information leak in triggered buffer

The 'scan' local struct is used to push data to user space from a
triggered buffer, but it has a hole between the two 16-bit data channels
and the timestamp. This hole is never initialized.

Initialize the struct to zero before using it to avoid pushing
uninitialized information to userspace.

Fixes: 91f75cc ("iio: temperature: tmp006: add triggered buffer support")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241204-iio_memset_scan_holes-v2-1-3f941592a76d@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/temperature/tmp006.c

@@ -252,6 +252,8 @@ static irqreturn_t tmp006_trigger_handler(int irq, void *p)
 	} scan;
 	s32 ret;
 
+	memset(&scan, 0, sizeof(scan));
+
 	ret = i2c_smbus_read_word_data(data->client, TMP006_VOBJECT);
 	if (ret < 0)
 		goto err;