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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Cristian Marussi <cristian.marussi@arm.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Sasha Levin <sashal@kernel.org>, linux-hwmon@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 15/19] hwmon: (scmi) Fix potential buffer overflow in scmi_hwmon_probe()
Date:   Mon, 20 Jul 2020 17:38:46 -0400
Message-Id: <20200720213851.407715-15-sashal@kernel.org>
In-Reply-To: <20200720213851.407715-1-sashal@kernel.org>
References: <20200720213851.407715-1-sashal@kernel.org>
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From: Cristian Marussi <cristian.marussi@arm.com>

[ Upstream commit 3ce17cd2b94907f6d91b81b32848044b84c97606 ]

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@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20200715121338.GA18761@e119603-lin.cambridge.arm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 91976b6ca3000..91bfecdb3f5ba 100644
--- a/drivers/hwmon/scmi-hwmon.c
+++ b/drivers/hwmon/scmi-hwmon.c
@@ -99,7 +99,7 @@ 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,
-- 
2.25.1