5.4-stable review patch. If anyone has any objections, please let me know.
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From: Abhishek Pandit-Subedi abhishekpandit@chromium.org
[ Upstream commit 99516f76db48e1a9d54cdfed63c1babcee4e71a5 ]
ucsi_register_altmode checks IS_ERR for the alt pointer and treats NULL as valid. When CONFIG_TYPEC_DP_ALTMODE is not enabled, ucsi_register_displayport returns NULL which causes a NULL pointer dereference in trace. Rather than return NULL, call typec_port_register_altmode to register DisplayPort alternate mode as a non-controllable mode when CONFIG_TYPEC_DP_ALTMODE is not enabled.
Reviewed-by: Benson Leung bleung@chromium.org Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Signed-off-by: Abhishek Pandit-Subedi abhishekpandit@chromium.org Signed-off-by: Jameson Thies jthies@google.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20240510201244.2968152-2-jthies@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/typec/ucsi/ucsi.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h index de87d0b8319d..179ad343f42f 100644 --- a/drivers/usb/typec/ucsi/ucsi.h +++ b/drivers/usb/typec/ucsi/ucsi.h @@ -446,7 +446,7 @@ ucsi_register_displayport(struct ucsi_connector *con, bool override, int offset, struct typec_altmode_desc *desc) { - return NULL; + return typec_port_register_altmode(con->port, desc); }
static inline void