Re: [PATCH v2] tty: fix saved termios reset race

[sashiko-bot@kernel.org]

> Resetting saved termios state on device registration is needed where a
> minor number can be reused for an entirely different device and where
> the old settings may prevent the port from even being opened (e.g. when
> CLOCAL is not set).
> 
> Not all TTY drivers guarantee that the minor number is no longer in use
> when registering devices however, something which can lead to a
> use-after-free when closing a TTY (and saving its termios) races with
> re-registration.
> 
> Add a new TTY_DRIVER_RESET_SAVED_TERMIOS flag to request that any saved
> termios state is reset on registration and only set it for drivers that
> make sure that the minor number is no longer in use.
> 
> Fixes: 93857edd9829 ("tty: reset termios state on device registration")
> Reported-by: Chengfeng Ye <nicoyip.dev@gmail.com>
> Link: https://lore.kernel.org/20260926184154.3017929-1-nicoyip.dev@gmail.com
> Cc: stable@vger.kernel.org	# 4.12
> Signed-off-by: Johan Hovold <johan@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260930131845.1809256-1-johan@kernel.org?part=1