Re: [PATCH v2] usb: gadget: f_ecm: Fix ecm_opts->bound logic in bind path

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Sep 04, 2025 at 02:52:00PM +0800, Kuen-Han Tsai wrote:
> The bound flag in ecm_opts is being set to true even if
> gether_register_netdev() failed.
> 
> Move the assignment of ecm_opts->bound to after the success check to
> ensure the flag only reflects the true state. The race condition on this
> flag is not a concern because the caller, configfs_composite_bind(),
> binds functions sequentially.
> 
> Fixes: d65e6b6e884a ("usb: gadget: f_ecm: Always set current gadget in ecm_bind()")
> Cc: stable@kernel.org
> Signed-off-by: Kuen-Han Tsai <khtsai@google.com>
> ---
>  drivers/usb/gadget/function/f_ecm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c
> index 027226325039..9f5ed6f32a62 100644
> --- a/drivers/usb/gadget/function/f_ecm.c
> +++ b/drivers/usb/gadget/function/f_ecm.c
> @@ -690,13 +690,14 @@ ecm_bind(struct usb_configuration *c, struct usb_function *f)
>  
>  	if (!ecm_opts->bound) {
>  		status = gether_register_netdev(ecm_opts->net);
> -		ecm_opts->bound = true;
>  	}
>  
>  	mutex_unlock(&ecm_opts->lock);
>  	if (status)
>  		return status;
>  
> +	ecm_opts->bound = true;
> +
>  	ecm_string_defs[1].s = ecm->ethaddr;
>  
>  	us = usb_gstrings_attach(cdev, ecm_strings,
> -- 
> 2.51.0.338.gd7d06c2dae-goog
> 
> 


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