Patch "firmware: arm_scmi: Improve checks in the info_get operations" has been added to the 5.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    firmware: arm_scmi: Improve checks in the info_get operations

to the 5.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     firmware-arm_scmi-improve-checks-in-the-info_get-ope.patch
and it can be found in the queue-5.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit fbe7de31f8b9171a71a4bf08220acf88684591f5
Author: Cristian Marussi <cristian.marussi@xxxxxxx>
Date:   Wed Aug 17 18:27:27 2022 +0100

    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@xxxxxxx
    Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx>
    Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
index 3ed7ae0d6781..96060bf90a24 100644
--- a/drivers/firmware/arm_scmi/clock.c
+++ b/drivers/firmware/arm_scmi/clock.c
@@ -450,9 +450,13 @@ 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 7288c6117838..7d0c7476d206 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -948,6 +948,9 @@ 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 704111f63993..6dd50ac82d10 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -78,7 +78,7 @@ 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);
@@ -460,7 +460,7 @@ 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);