Re: [PATCH] backlight: check null deference of name when device isregistered

[Andrew Morton]

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)?

If "no" then why don't we declare that "passing name=NULL is a bug" and
leave the code as-is?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/