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hwmon: (cros_ec) Prevent read overflow in probe()

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The "resp.sensor_name" comes from cros_ec_cmd() and it hasn't necessarily
been NUL terminated.  We had not intended to read past "sensor_name_size"
bytes, however, there is a width vs precision bug in the format string.
The format needs to be precision '%.*s' instead of width '%*s'.
Precision prevents an out of bounds read, but width is a no-op.

Fixes: bc3e452580 ("hwmon: add ChromeOS EC driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/42331b70-bd3c-496c-8c79-3ec4faad40b8@moroto.mountain
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
This commit is contained in:
Dan Carpenter
2024-06-06 16:12:11 +03:00
committed by Tzung-Bi Shih
parent 04ca0a51f1
commit 1f72dd0462
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/cros_ec_hwmon.c
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@@ -212,7 +212,7 @@ static void cros_ec_hwmon_probe_temp_sensors(struct device *dev, struct cros_ec_
continue;
sensor_name_size = strnlen(resp.sensor_name, sizeof(resp.sensor_name));
priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%*s",
priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%.*s",
(int)sensor_name_size,
resp.sensor_name);
}