linux-kernel - Re: [PATCH v1] usb: typec: tcpm: fix use-after-free case in tcpm_register_source

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Message-ID: <begphn3f6rdcwgmyewnk6chmws643zd2gcucphntjcrpwhxxmp@75v7gll7non6>
Date: Sun, 19 May 2024 11:00:00 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Amit Sunil Dhamne <amitsd@...gle.com>
Cc: linux@...ck-us.net, heikki.krogerus@...ux.intel.com, 
	gregkh@...uxfoundation.org, megi@....cz, badhri@...gle.com, rdbabiera@...gle.com, 
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v1] usb: typec: tcpm: fix use-after-free case in
 tcpm_register_source_caps

On Tue, May 14, 2024 at 03:01:31PM -0700, Amit Sunil Dhamne wrote:
> There could be a potential use-after-free case in
> tcpm_register_source_caps(). This could happen when:
>  * new (say invalid) source caps are advertised
>  * the existing source caps are unregistered
>  * tcpm_register_source_caps() returns with an error as
>    usb_power_delivery_register_capabilities() fails
> 
> This causes port->partner_source_caps to hold on to the now freed source
> caps.
> 
> Reset port->partner_source_caps value to NULL after unregistering
> existing source caps.
> 
> Fixes: 230ecdf71a64 ("usb: typec: tcpm: unregister existing source caps before re-registration")
> Cc: stable@...r.kernel.org
> Signed-off-by: Amit Sunil Dhamne <amitsd@...gle.com>
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


-- 
With best wishes
Dmitry