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platform/x86: wmi: Check if event data is not NULL

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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@gmx.de>
Link: https://lore.kernel.org/r/20240219115919.16526-3-W_Armin@gmx.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Armin Wolf 2024-02-19 12:59:16 +01:00 committed by Ilpo Järvinen
parent 4f299135d5
commit 125619112d
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GPG Key ID: 59AC4F6153E5CE31
1 changed files with 9 additions and 2 deletions
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11
drivers/platform/x86/wmi.c
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@ -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 no 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)