The driver must make sure there is an actual connection
before checking details about the USB Power Delivery
contract. Those details are not valid unless there is a
connection.
This fixes NULL pointer dereference that is caused by an
attempt to register bogus partner alternate mode that the
firmware on some platform may report before the actual
connection.
Fixes: 6cbe4b2d5a3f ("usb: typec: ucsi: Check the partner alt modes always if there is PD contract")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=215117
Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
drivers/usb/typec/ucsi/ucsi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 9d6b7e02d6efb..f0c2fa19f3e0f 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1164,7 +1164,9 @@ static int ucsi_register_port(struct ucsi *ucsi, int index)
ret = 0;
}
- if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) == UCSI_CONSTAT_PWR_OPMODE_PD) {
+ if (con->partner &&
+ UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
+ UCSI_CONSTAT_PWR_OPMODE_PD) {
ucsi_get_src_pdos(con);
ucsi_check_altmodes(con);
}
--
2.34.1
