Only buffer objects are valid return values of _STR.
If something else is returned description_show() will access invalid
memory.
Fixes: d1efe3c324ea ("ACPI: Add new sysfs interface to export device description")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
---
drivers/acpi/device_sysfs.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
index 23373faa35ec..95a19e3569c8 100644
--- a/drivers/acpi/device_sysfs.c
+++ b/drivers/acpi/device_sysfs.c
@@ -540,8 +540,9 @@ int acpi_device_setup_files(struct acpi_device *dev)
* If device has _STR, 'description' file is created
*/
if (acpi_has_method(dev->handle, "_STR")) {
- status = acpi_evaluate_object(dev->handle, "_STR",
- NULL, &buffer);
+ status = acpi_evaluate_object_typed(dev->handle, "_STR",
+ NULL, &buffer,
+ ACPI_TYPE_BUFFER);
if (ACPI_FAILURE(status))
buffer.pointer = NULL;
dev->pnp.str_obj = buffer.pointer;
--
2.45.2
