linux-kernel - [PATCH] iio: adc: ads124: avoid buffer overflow

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Message-Id: <20190331185423.11749-1-vincent.stehle@laposte.net>
Date:   Sun, 31 Mar 2019 20:54:23 +0200
From:   Vincent Stehlé <vincent.stehle@...oste.net>
To:     linux-iio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Vincent Stehlé <vincent.stehle@...oste.net>,
        Dan Murphy <dmurphy@...com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH] iio: adc: ads124: avoid buffer overflow

When initializing the priv->data array starting from index 1, there is one
less element to consider than when initializing the full array.

Fixes: e717f8c6dfec8f76 ("iio: adc: Add the TI ads124s08 ADC code")
Signed-off-by: Vincent Stehlé <vincent.stehle@...oste.net>
Cc: Dan Murphy <dmurphy@...com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/iio/adc/ti-ads124s08.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ti-ads124s08.c b/drivers/iio/adc/ti-ads124s08.c
index 53f17e4f2f230..552c2be8d87ad 100644
--- a/drivers/iio/adc/ti-ads124s08.c
+++ b/drivers/iio/adc/ti-ads124s08.c
@@ -202,7 +202,7 @@ static int ads124s_read(struct iio_dev *indio_dev, unsigned int chan)
 	};
 
 	priv->data[0] = ADS124S08_CMD_RDATA;
-	memset(&priv->data[1], ADS124S08_CMD_NOP, sizeof(priv->data));
+	memset(&priv->data[1], ADS124S08_CMD_NOP, sizeof(priv->data) - 1);
 
 	ret = spi_sync_transfer(priv->spi, t, ARRAY_SIZE(t));
 	if (ret < 0)
-- 
2.20.1