linux-kernel - [PATCH] iio: potentiometer: ds1803: Remove VLA usage

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Date:   Fri,  9 Mar 2018 00:15:33 +0530
From:   Himanshu Jha <himanshujha199640@...il.com>
To:     jic23@...nel.org
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        garsilva@...eddedor.com, keescook@...omium.org,
        Himanshu Jha <himanshujha199640@...il.com>
Subject: [PATCH] iio: potentiometer: ds1803: Remove VLA usage

In preparation to enabling -Wvla, remove VLA usage and replace it
with fixed a fixed length array and therefore, prevent potential
stack overflow attacks.

Fixed as a part of the discussion to remove all VLAs from the kernel:
https://lkml.org/lkml/2018/3/7/621

Cc: keescook@...omium.org
Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
---
 drivers/iio/potentiometer/ds1803.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
index 9b0ff4a..6bf12c9 100644
--- a/drivers/iio/potentiometer/ds1803.c
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -64,7 +64,7 @@ static int ds1803_read_raw(struct iio_dev *indio_dev,
 	struct ds1803_data *data = iio_priv(indio_dev);
 	int pot = chan->channel;
 	int ret;
-	u8 result[indio_dev->num_channels];
+	u8 result[ARRAY_SIZE(ds1803_channels)];
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-- 
2.7.4