linux-kernel - [PATCH] iio: adc: ad7173: fix channels index for syscalib

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Message-Id: <20250703-iio-adc-ad7173-fix-channels-index-for-syscalib_mode-v1-1-7fdaedb9cac0@baylibre.com>
Date: Thu, 03 Jul 2025 14:51:17 -0500
From: David Lechner <dlechner@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, 
 Guillaume Ranquet <granquet@...libre.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH] iio: adc: ad7173: fix channels index for syscalib_mode

Fix the index used to look up the channel when accessing the
syscalib_mode attribute. The address field is a 0-based index (same
as scan_index) that it used to access the channel in the
ad7173_channels array throughout the driver. The channels field, on
the other hand, may not match the address field depending on the
channel configuration specified in the device tree and could result
in an out-of-bounds access.

Fixes: 031bdc8aee01 ("iio: adc: ad7173: add calibration support")
Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad7173.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index dd9fa35555c79ead5a1b88d1dc6cc3db122502be..03412895f6dc71fcf8a07d09eb9f94a3840f02ef 100644
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -318,7 +318,7 @@ static int ad7173_set_syscalib_mode(struct iio_dev *indio_dev,
 {
 	struct ad7173_state *st = iio_priv(indio_dev);
 
-	st->channels[chan->channel].syscalib_mode = mode;
+	st->channels[chan->address].syscalib_mode = mode;
 
 	return 0;
 }
@@ -328,7 +328,7 @@ static int ad7173_get_syscalib_mode(struct iio_dev *indio_dev,
 {
 	struct ad7173_state *st = iio_priv(indio_dev);
 
-	return st->channels[chan->channel].syscalib_mode;
+	return st->channels[chan->address].syscalib_mode;
 }
 
 static ssize_t ad7173_write_syscalib(struct iio_dev *indio_dev,
@@ -347,7 +347,7 @@ static ssize_t ad7173_write_syscalib(struct iio_dev *indio_dev,
 	if (!iio_device_claim_direct(indio_dev))
 		return -EBUSY;
 
-	mode = st->channels[chan->channel].syscalib_mode;
+	mode = st->channels[chan->address].syscalib_mode;
 	if (sys_calib) {
 		if (mode == AD7173_SYSCALIB_ZERO_SCALE)
 			ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_SYS_ZERO,

---
base-commit: 6742eff60460e77158d4f1b233f17e0345c9e66a
change-id: 20250703-iio-adc-ad7173-fix-channels-index-for-syscalib_mode-49b404e99e0c

Best regards,
-- 
David Lechner <dlechner@...libre.com>