Re: [PATCH v2] USB: cdc-acm: fix minor-number release

On 07.09.21 10:23, Johan Hovold wrote:

If the driver runs out of minor numbers it would release minor 0 and allow another device to claim the minor while still in use.

Fortunately, registering the tty class device of the second device would fail (with a stack dump) due to the sysfs name collision so no memory is leaked.

Fixes: cae2bc768d17 ("usb: cdc-acm: Decrement tty port's refcount if probe() fail") Cc: stable@vger.kernel.org # 4.19 Cc: Jaejoong Kim climbbb.kim@gmail.com Signed-off-by: Johan Hovold johan@kernel.org

Acked-by: Oliver Neukum oneukum@suse.com