[PATCH 2/2] platform/chrome: cros_usbpd_notify: check ACPI companion

[Jiale Yao]

The ACPI probe installs a notification handler through the device ACPI
companion without checking that the companion exists. A force-bound
platform device can therefore cause a NULL pointer dereference.

Return -ENODEV before allocating probe resources when the companion is
missing.

Fixes: 7e91e1ac60bb ("platform/chrome: cros_usbpd_notify: Amend ACPI driver to plat")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/platform/chrome/cros_usbpd_notify.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
index 25da31ec1996..1d82c74583cb 100644
--- a/drivers/platform/chrome/cros_usbpd_notify.c
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -105,6 +105,8 @@ static int cros_usbpd_notify_probe_acpi(struct platform_device *pdev)
 	acpi_status status;
 
 	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return -ENODEV;
 
 	pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
 	if (!pdnotify)
-- 
2.34.1