On Tue, 2009-07-28 at 23:56 +0800, Julia Lawall wrote: > From: Julia Lawall <julia@xxxxxxx> > > backlight_device_register may return an ERR_PTR value rather than a valid > pointer. > > A simplified version of the semantic match that finds this problem is as > follows: (http://coccinelle.lip6.fr/) > Signed-off-by: Julia Lawall <julia@xxxxxxx> > > --- > drivers/acpi/video.c | 2 ++ > 1 files changed, 2 insertions(+), 0 deletions(-) > > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c > index 8851315..29788db 100644 > --- a/drivers/acpi/video.c > +++ b/drivers/acpi/video.c > @@ -982,6 +982,8 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) > sprintf(name, "acpi_video%d", count++); > device->backlight = backlight_device_register(name, > NULL, device, &acpi_backlight_ops); > + if (IS_ERR(device->backlight)) > + return; we should kfree(name) here. > device->backlight->props.max_brightness = device->brightness->count-3; > kfree(name); how about this one? backlight_device_register may return an ERR_PTR value rather than a valid pointer. Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> --- drivers/acpi/video.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Index: linux-2.6/drivers/acpi/video.c =================================================================== --- linux-2.6.orig/drivers/acpi/video.c +++ linux-2.6/drivers/acpi/video.c @@ -982,8 +982,10 @@ static void acpi_video_device_find_cap(s sprintf(name, "acpi_video%d", count++); device->backlight = backlight_device_register(name, NULL, device, &acpi_backlight_ops); - device->backlight->props.max_brightness = device->brightness->count-3; kfree(name); + if (IS_ERR(device->backlight)) + return; + device->backlight->props.max_brightness = device->brightness->count-3; result = sysfs_create_link(&device->backlight->dev.kobj, &device->dev->dev.kobj, "device"); -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
