WMI event drivers which do not have no_notify_data set expect
that each WMI event contains valid data. Evaluating _WED however
might return no data, which can cause issues with such drivers.
Fix this by validating that evaluating _WED did return data.
Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
---
drivers/platform/x86/wmi.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 8fb90b726f50..d0fe8153f803 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -1210,6 +1210,7 @@ static void wmi_notify_driver(struct wmi_block *wblock)
{
struct wmi_driver *driver = drv_to_wdrv(wblock->dev.dev.driver);
struct acpi_buffer data = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj = NULL;
acpi_status status;
if (!driver->no_notify_data) {
@@ -1218,12 +1219,18 @@ static void wmi_notify_driver(struct wmi_block *wblock)
dev_warn(&wblock->dev.dev, "Failed to get event data\n");
return;
}
+
+ obj = data.pointer;
+ if (!obj) {
+ dev_warn(&wblock->dev.dev, "Event contains not event data\n");
+ return;
+ }
}
if (driver->notify)
- driver->notify(&wblock->dev, data.pointer);
+ driver->notify(&wblock->dev, obj);
- kfree(data.pointer);
+ kfree(obj);
}
static int wmi_notify_device(struct device *dev, void *data)
--
2.39.2
