linux-kernel - [PATCH] platform/chrome: cros_ec_sensorhub: Off by one in cros_sensorhub_send

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Message-ID: <20200407092935.GJ68494@mwanda>
Date:   Tue, 7 Apr 2020 12:29:35 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Benson Leung <bleung@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] platform/chrome: cros_ec_sensorhub: Off by one in
 cros_sensorhub_send_sample()

The sensorhub->push_data[] array has sensorhub->sensor_num elements.
It's allocated in cros_ec_sensorhub_ring_add().  So the > should be >=
to prevent a read one element beyond the end of the array.

Fixes: 145d59baff59 ("platform/chrome: cros_ec_sensorhub: Add FIFO support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/platform/chrome/cros_ec_sensorhub_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
index 230e6cf3da2f..85e8ba782f0c 100644
--- a/drivers/platform/chrome/cros_ec_sensorhub_ring.c
+++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
@@ -40,7 +40,7 @@ cros_sensorhub_send_sample(struct cros_ec_sensorhub *sensorhub,
 	int id = sample->sensor_id;
 	struct iio_dev *indio_dev;
 
-	if (id > sensorhub->sensor_num)
+	if (id >= sensorhub->sensor_num)
 		return -EINVAL;
 
 	cb = sensorhub->push_data[id].push_data_cb;
-- 
2.25.1