From 4b4fe3b62e8d88068083218d3e42c45223b51d29 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Sat, 8 Aug 2009 00:26:25 -0700 Subject: [PATCH] ACPI: video - fix potential crash when unloading thermal_cooling_device_register() returns error encoded in a pointer when it fails in which case we need to explictly set device->cdev to NULL so we don't try to unregister it when unloading. Signed-off-by: Dmitry Torokhov Acked-by: Zhang Rui Signed-off-by: Len Brown --- drivers/acpi/video.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 2020907921cc..aab385188599 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -997,8 +997,18 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) device->cdev = thermal_cooling_device_register("LCD", device->dev, &video_cooling_ops); - if (IS_ERR(device->cdev)) + if (IS_ERR(device->cdev)) { + /* + * Set cdev to NULL so we don't crash trying to + * free it. + * Also, why the hell we are returning early and + * not attempt to register video output if cooling + * device registration failed? + * -- dtor + */ + device->cdev = NULL; return; + } dev_info(&device->dev->dev, "registered as cooling_device%d\n", device->cdev->id); -- GitLab