From: Hans de Goede <hdegoede@xxxxxxxxxx> [ Upstream commit 4a49194f587a62d972b602e3e1a2c3cfe6567966 ] acpi_dev_hid_match() does not check for adev == NULL, dereferencing it unconditional. Add a check for adev being NULL before calling acpi_dev_hid_match(). At the moment acpi_quirk_skip_serdev_enumeration() is never called with a controller_parent without an ACPI companion, but better safe than sorry. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Link: https://patch.msgid.link/20241109220028.83047-1-hdegoede@xxxxxxxxxx Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/acpi/x86/utils.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c index 5a3bf81746a55..ac6bc6482ce16 100644 --- a/drivers/acpi/x86/utils.c +++ b/drivers/acpi/x86/utils.c @@ -537,7 +537,7 @@ int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *s * Set skip to true so that the tty core creates a serdev ctrl device. * The backlight driver will manually create the serdev client device. */ - if (acpi_dev_hid_match(adev, "DELL0501")) { + if (adev && acpi_dev_hid_match(adev, "DELL0501")) { *skip = true; /* * Create a platform dev for dell-uart-backlight to bind to. -- 2.43.0
