linux-kernel - Re: [PATCH] USB: cdc-acm: fix minor-number release

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Date:   Mon, 6 Sep 2021 15:02:43 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Johan Hovold <johan@...nel.org>, Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Jaejoong Kim <climbbb.kim@...il.com>
Subject: Re: [PATCH] USB: cdc-acm: fix minor-number release


On 06.09.21 14:43, Johan Hovold wrote:
> @@ -1323,8 +1324,10 @@ static int acm_probe(struct usb_interface *intf,
>  	usb_get_intf(acm->control); /* undone in destruct() */
>  
>  	minor = acm_alloc_minor(acm);
> -	if (minor < 0)
> +	if (minor < 0) {
> +		acm->minor = ACM_TTY_MINORS;
>  		goto err_put_port;


Hi,

Congratulations for catching that one.

May I request to improve understandability of the code that you give
the constant a distinct name for this purpose? Something like

ACM_MINOR_POISON or ACM_INVALID_MINOR

so that normal people can understand the fixed code?

    Regards
        Oliver