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From:   Evgeny Novikov <novikov@ispras.ru>
To:     Jean Delvare <jdelvare@suse.com>
Cc:     Evgeny Novikov <novikov@ispras.ru>,
        Guenter Roeck <linux@roeck-us.net>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>, linux-hwmon@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        ldv-project@linuxtesting.org
Subject: [PATCH] hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow
Date:   Fri,  3 Jul 2020 14:15:18 +0300
Message-Id: <20200703111518.9644-1-novikov@ispras.ru>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

aspeed_create_fan() reads a pwm_port value using of_property_read_u32().
If pwm_port will be more than ARRAY_SIZE(pwm_port_params), there will be
a buffer overflow in
aspeed_create_pwm_port()->aspeed_set_pwm_port_enable(). The patch fixes
the potential buffer overflow.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
---
 drivers/hwmon/aspeed-pwm-tacho.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c
index 33fb54845bf6..3d8239fd66ed 100644
--- a/drivers/hwmon/aspeed-pwm-tacho.c
+++ b/drivers/hwmon/aspeed-pwm-tacho.c
@@ -851,6 +851,8 @@ static int aspeed_create_fan(struct device *dev,
 	ret = of_property_read_u32(child, "reg", &pwm_port);
 	if (ret)
 		return ret;
+	if (pwm_port >= ARRAY_SIZE(pwm_port_params))
+		return -EINVAL;
 	aspeed_create_pwm_port(priv, (u8)pwm_port);
 
 	ret = of_property_count_u8_elems(child, "cooling-levels");
-- 
2.16.4