From: Cristian Marussi <cristian.marussi@xxxxxxx> [ Upstream commit 76f89c954788763db575fb512a40bd483864f1e9 ] Accessing sensor domains descriptors by the index upon the SCMI drivers requests through the SCMI sensor operations interface can potentially lead to out-of-bound violations if the SCMI driver misbehave. Add an internal consistency check before any such domains descriptors accesses. Link: https://lore.kernel.org/r/20220817172731.1185305-4-cristian.marussi@xxxxxxx Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/firmware/arm_scmi/sensors.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c index 7d0c7476d206..0b5853fa9d87 100644 --- a/drivers/firmware/arm_scmi/sensors.c +++ b/drivers/firmware/arm_scmi/sensors.c @@ -762,6 +762,10 @@ static int scmi_sensor_config_get(const struct scmi_protocol_handle *ph, { int ret; struct scmi_xfer *t; + struct sensors_info *si = ph->get_priv(ph); + + if (sensor_id >= si->num_sensors) + return -EINVAL; ret = ph->xops->xfer_get_init(ph, SENSOR_CONFIG_GET, sizeof(__le32), sizeof(__le32), &t); @@ -771,7 +775,6 @@ static int scmi_sensor_config_get(const struct scmi_protocol_handle *ph, put_unaligned_le32(sensor_id, t->tx.buf); ret = ph->xops->do_xfer(ph, t); if (!ret) { - struct sensors_info *si = ph->get_priv(ph); struct scmi_sensor_info *s = si->sensors + sensor_id; *sensor_config = get_unaligned_le64(t->rx.buf); @@ -788,6 +791,10 @@ static int scmi_sensor_config_set(const struct scmi_protocol_handle *ph, int ret; struct scmi_xfer *t; struct scmi_msg_sensor_config_set *msg; + struct sensors_info *si = ph->get_priv(ph); + + if (sensor_id >= si->num_sensors) + return -EINVAL; ret = ph->xops->xfer_get_init(ph, SENSOR_CONFIG_SET, sizeof(*msg), 0, &t); @@ -800,7 +807,6 @@ static int scmi_sensor_config_set(const struct scmi_protocol_handle *ph, ret = ph->xops->do_xfer(ph, t); if (!ret) { - struct sensors_info *si = ph->get_priv(ph); struct scmi_sensor_info *s = si->sensors + sensor_id; s->sensor_config = sensor_config; @@ -831,8 +837,11 @@ static int scmi_sensor_reading_get(const struct scmi_protocol_handle *ph, int ret; struct scmi_xfer *t; struct scmi_msg_sensor_reading_get *sensor; + struct scmi_sensor_info *s; struct sensors_info *si = ph->get_priv(ph); - struct scmi_sensor_info *s = si->sensors + sensor_id; + + if (sensor_id >= si->num_sensors) + return -EINVAL; ret = ph->xops->xfer_get_init(ph, SENSOR_READING_GET, sizeof(*sensor), 0, &t); @@ -841,6 +850,7 @@ static int scmi_sensor_reading_get(const struct scmi_protocol_handle *ph, sensor = t->tx.buf; sensor->id = cpu_to_le32(sensor_id); + s = si->sensors + sensor_id; if (s->async) { sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC); ret = ph->xops->do_xfer_with_response(ph, t); @@ -895,9 +905,13 @@ scmi_sensor_reading_get_timestamped(const struct scmi_protocol_handle *ph, int ret; struct scmi_xfer *t; struct scmi_msg_sensor_reading_get *sensor; + struct scmi_sensor_info *s; struct sensors_info *si = ph->get_priv(ph); - struct scmi_sensor_info *s = si->sensors + sensor_id; + if (sensor_id >= si->num_sensors) + return -EINVAL; + + s = si->sensors + sensor_id; if (!count || !readings || (!s->num_axis && count > 1) || (s->num_axis && count > s->num_axis)) return -EINVAL; -- 2.35.1
