linux-kernel - [RESEND][PATCH] hwmon: scmi: fix potential buffer overflow in scmi_hwmon

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Message-ID: <20200715121338.GA18761@e119603-lin.cambridge.arm.com>
Date:   Wed, 15 Jul 2020 13:13:38 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Cc:     jdelvare@...e.com, linux@...ck-us.net, cristian.marussi@....com,
        sudeep.holla@....com
Subject: [RESEND][PATCH] hwmon: scmi: fix potential buffer overflow in
 scmi_hwmon_probe()

SMATCH detected a potential buffer overflow in the manipulation of
hwmon_attributes array inside the scmi_hwmon_probe function:

drivers/hwmon/scmi-hwmon.c:226
 scmi_hwmon_probe() error: buffer overflow 'hwmon_attributes' 6 <= 9

Fix it by statically declaring the size of the array as the maximum
possible as defined by hwmon_max define.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/hwmon/scmi-hwmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/scmi-hwmon.c b/drivers/hwmon/scmi-hwmon.c
index 281454c5c5b1..758f66fc9afe 100644
--- a/drivers/hwmon/scmi-hwmon.c
+++ b/drivers/hwmon/scmi-hwmon.c
@@ -149,7 +149,7 @@ static enum hwmon_sensor_types scmi_types[] = {
 	[ENERGY] = hwmon_energy,
 };
 
-static u32 hwmon_attributes[] = {
+static u32 hwmon_attributes[hwmon_max] = {
 	[hwmon_chip] = HWMON_C_REGISTER_TZ,
 	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
 	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
-- 
2.17.1