From 3be6bd690da0dafa55eb65279fb25297fcfe19d5 Mon Sep 17 00:00:00 2001 From: Anton Vasilyev Date: Thu, 10 Aug 2017 19:46:32 +0300 Subject: [PATCH] hwmon: (stts751) buffer overrun on wrong chip configuration If stts751 hw by some reason reports conversion rate bigger then 9: ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE); then dereferencing stts751_intervals[priv->interval] leads to buffer overrun. The patch adds sanity check for value stored on chip. Found by Linux Driver Verification project (linuxtesting.org). Fixes: 7f07ec0fa17a ("hwmon: new driver for ST stts751 thermal sensor") Signed-off-by: Anton Vasilyev Signed-off-by: Guenter Roeck --- drivers/hwmon/stts751.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hwmon/stts751.c b/drivers/hwmon/stts751.c index d56251d6eec2..3f940fb67dc6 100644 --- a/drivers/hwmon/stts751.c +++ b/drivers/hwmon/stts751.c @@ -718,6 +718,10 @@ static int stts751_read_chip_config(struct stts751_priv *priv) ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE); if (ret < 0) return ret; + if (ret >= ARRAY_SIZE(stts751_intervals)) { + dev_err(priv->dev, "Unrecognized conversion rate 0x%x\n", ret); + return -ENODEV; + } priv->interval = ret; ret = stts751_read_reg16(priv, &priv->event_max, -- 2.20.1