Hi,
Krzysztof Opasiak <k.opas...@samsung.com> writes:
> Every function should have a type and instance name.
> Unfortunately in most cases instance name was left unused and unchecked.
> This may lead to situations like FunctionFS device name identified by ""
> or some misleading debug messages from TCM like:
>
> tcm: Activating
>
> To avoid this let's add a check that instance name should have at least
> one character.
>
> Reported-by: Stefan Agner <ste...@agner.ch>
> Signed-off-by: Krzysztof Opasiak <k.opas...@samsung.com>
> ---
> drivers/usb/gadget/configfs.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
> index aeb9f3c40521..bdc9ec597d6a 100644
> --- a/drivers/usb/gadget/configfs.c
> +++ b/drivers/usb/gadget/configfs.c
> @@ -548,6 +548,11 @@ static struct config_group *function_make(
> *instance_name = '\0';
> instance_name++;
>
> + if (*instance_name == '\0') {
> + pr_err("Instance name (after .) should not be empty\n");
> + return ERR_PTR(-EINVAL);
> + }aaaaaand just like that you break potentially existing scripts :-) We need to find a better way of enforcing a name which doesn't break existing users. -- balbi
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