On Mon, Mar 30, 2015 at 4:08 AM, Ricardo Ribalda Delgado
<ricardo.riba...@gmail.com> wrote:
> If the final name does not fit the string there is a potential
> endless-loop.
>
> Reported-by: Geert Uytterhoeven <ge...@linux-m68k.org>
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
> ---
> drivers/leds/led-class.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 294d6d6..2ffe8b1 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -223,12 +223,17 @@ static int led_classdev_next_name(const char
> *init_name, char *name,
> size_t len)
> {
> int i = 0;
> + int ret = 0;
>
> strlcpy(name, init_name, len);
>
> - while (class_find_device(leds_class, NULL, name, match_name))
> + while (class_find_device(leds_class, NULL, name, match_name) &&
> + (ret < len))
> snprintf(name, len, "%s_%d", init_name, ++i);
class_find_device will get a reference for a device. That reference must be
dropped using put_device(). See the definition for class_find_device in
drivers/base/class.c and other usage examples in the kernel. So this
function call will only work the first time.
Alan Tull
>
> + if (ret >= len)
> + return -ENOMEM;
> +
> return i;
> }
>
> @@ -243,6 +248,9 @@ int led_classdev_register(struct device *parent, struct
> led_classdev *led_cdev)
> int ret;
>
> ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
> + if (ret < 0)
> + return ret;
> +
> led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
> led_cdev, led_cdev->groups, "%s", name);
> if (IS_ERR(led_cdev->dev))
> --
> 2.1.4
>
> --
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