HID: hid-sensor-custom: Fix buffer overrun in device name

On some platforms there are some platform devices created with
invalid names. For example: "HID-SENSOR-INT-020b?.39.auto" instead
of "HID-SENSOR-INT-020b.39.auto"

This string include some invalid characters, hence it will fail to
properly load the driver which will handle this custom sensor. Also
it is a problem for some user space tools, which parses the device
names from ftrace and dmesg.

This is because the string, real_usage, is not NULL terminated and
printed with %s to form device name.

To address this, initialize the real_usage string with 0s.

Reported-and-tested-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217169
Fixes: 98c062e82451 ("HID: hid-sensor-custom: Allow more custom iio sensors")
Cc: stable@vger.kernel.org
Suggested-by: Philipp Jungkamp <p.jungkamp@gmx.net>
Signed-off-by: Philipp Jungkamp <p.jungkamp@gmx.net>
Signed-off-by: Todd Brandt <todd.e.brandt@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
index 3e3f89e01d819bb30b2eb30c36adc1d0ba89df42..d85398721659ab6ac90ddb9e48fea4c89fd90e38 100644 (file)
--- a/drivers/hid/hid-sensor-custom.c
+++ b/drivers/hid/hid-sensor-custom.c
@@ -940,7 +940,7 @@ hid_sensor_register_platform_device(struct platform_device *pdev,
                                    struct hid_sensor_hub_device *hsdev,
                                    const struct hid_sensor_custom_match *match)
 {
-       char real_usage[HID_SENSOR_USAGE_LENGTH];
+       char real_usage[HID_SENSOR_USAGE_LENGTH] = { 0 };
        struct platform_device *custom_pdev;
        const char *dev_name;
        char *c;