firmware: arm_scmi: Improve checks in the info_get operations

[ Upstream commit 1ecb7d27b1af6705e9a4e94415b4d8cc8cf2fbfb ]

SCMI protocols abstract and expose a number of protocol specific
resources like clocks, sensors and so on. Information about such
specific domain resources are generally exposed via an `info_get`
protocol operation.

Improve the sanity check on these operations where needed.

Link: https://lore.kernel.org/r/20220817172731.1185305-3-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
index 492f3a9..e76194a 100644 (file)
--- a/drivers/firmware/arm_scmi/clock.c
+++ b/drivers/firmware/arm_scmi/clock.c
@@ -315,9 +315,13 @@ static int scmi_clock_count_get(const struct scmi_protocol_handle *ph)
 static const struct scmi_clock_info *
 scmi_clock_info_get(const struct scmi_protocol_handle *ph, u32 clk_id)
 {
+       struct scmi_clock_info *clk;
        struct clock_info *ci = ph->get_priv(ph);
-       struct scmi_clock_info *clk = ci->clk + clk_id;
 
+       if (clk_id >= ci->num_clocks)
+               return NULL;
+
+       clk = ci->clk + clk_id;
        if (!clk->name[0])
                return NULL;
 

diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index cdbb287..b479a9e 100644 (file)
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -817,6 +817,9 @@ scmi_sensor_info_get(const struct scmi_protocol_handle *ph, u32 sensor_id)
 {
        struct sensors_info *si = ph->get_priv(ph);
 
+       if (sensor_id >= si->num_sensors)
+               return NULL;
+
        return si->sensors + sensor_id;
 }
 

diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 80e781c..d22f622 100644 (file)
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -74,7 +74,7 @@ struct scmi_protocol_handle;
 struct scmi_clk_proto_ops {
        int (*count_get)(const struct scmi_protocol_handle *ph);
 
-       const struct scmi_clock_info *(*info_get)
+       const struct scmi_clock_info __must_check *(*info_get)
                (const struct scmi_protocol_handle *ph, u32 clk_id);
        int (*rate_get)(const struct scmi_protocol_handle *ph, u32 clk_id,
                        u64 *rate);
@@ -452,7 +452,7 @@ enum scmi_sensor_class {
  */
 struct scmi_sensor_proto_ops {
        int (*count_get)(const struct scmi_protocol_handle *ph);
-       const struct scmi_sensor_info *(*info_get)
+       const struct scmi_sensor_info __must_check *(*info_get)
                (const struct scmi_protocol_handle *ph, u32 sensor_id);
        int (*trip_point_config)(const struct scmi_protocol_handle *ph,
                                 u32 sensor_id, u8 trip_id, u64 trip_value);