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@vger.kernel.org Signed-off-by: Amit Sunil Dhamne amitsd@google.com
Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com
drivers/usb/typec/tcpm/tcpm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 8a1af08f71b6..be4127ef84e9 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -3014,8 +3014,10 @@ static int tcpm_register_source_caps(struct tcpm_port *port) memcpy(caps.pdo, port->source_caps, sizeof(u32) * port->nr_source_caps); caps.role = TYPEC_SOURCE;
- if (cap)
- if (cap) { usb_power_delivery_unregister_capabilities(cap);
port->partner_source_caps = NULL;- }
cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps); if (IS_ERR(cap))
base-commit: 51474ab44abf907023a8a875e799b07de461e466
2.45.0.rc1.225.g2a3ae87e7f-goog