On Tuesday, January 08, 2013 9:02 AM, Andrew Morton wrote
> On Fri, 04 Jan 2013 17:29:11 +0900
> Jingoo Han <jg1.han@xxxxxxxxxxx> wrote:
>
> > NULL deference of name is checked when device is registered.
> > If the name is null, it will cause a kernel oops in dev_set_name().
> >
> > ...
> >
> > --- a/drivers/video/backlight/backlight.c
> > +++ b/drivers/video/backlight/backlight.c
> > @@ -292,6 +292,11 @@ struct backlight_device *backlight_device_register(const char *name,
> > struct backlight_device *new_bd;
> > int rc;
> >
> > + if (name == NULL) {
> > + pr_err("backlight name is null\n");
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > pr_debug("backlight_device_register: name=%s\n", name);
>
> I don't understand this.
>
> Is there some driver which is calling these functions with name=NULL?
> If so, which one(s)?
No, there is no one.
>
> If "no" then why don't we declare that "passing name=NULL is a bug" and
> leave the code as-is?
Do you mean following?
+ if (name == NULL)
+ pr_err("passing name=NULL is a bug");
+
pr_debug("backlight_device_register: name=%s\n", name);
Best regards,
Jingoo Han
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