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

[Dmitry Baryshkov]

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@xxxxxxxxxxxxxxx
> Signed-off-by: Amit Sunil Dhamne <amitsd@xxxxxxxxxx>
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 

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


-- 
With best wishes
Dmitry