ACPI: pfr_telemetry: Fix info leak in pfrt_log_ioctl()

The "data_info" struct is copied to the user.  It has a 4 byte struct
hole after the last struct member so we need to memset that to avoid
copying uninitialized stack data to the user.

Fixes: b0013e0 ("ACPI: Introduce Platform Firmware Runtime Telemetry driver")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: Dan Carpenter

drivers/acpi/pfr_telemetry.c

@@ -83,6 +83,7 @@ static int get_pfrt_log_data_info(struct pfrt_log_data_info *data_info,
 	union acpi_object *out_obj, in_obj, in_buf;
 	int ret = -EBUSY;
 
+	memset(data_info, 0, sizeof(*data_info));
 	memset(&in_obj, 0, sizeof(in_obj));
 	memset(&in_buf, 0, sizeof(in_buf));
 	in_obj.type = ACPI_TYPE_PACKAGE;