linux-kernel - [PATCH v2] iio: common: scmi_iio: use kcalloc() instead of kzalloc()

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Message-Id: <20250819125017.635182-1-rongqianfeng@vivo.com>
Date: Tue, 19 Aug 2025 20:50:17 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Jyoti Bhayana <jbhayana@...gle.com>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH v2] iio: common: scmi_iio: use kcalloc() instead of kzalloc()

Replace calls of devm_kzalloc() with devm_kcalloc() in scmi_alloc_iiodev()
and scmi_iio_set_sampling_freq_avail() for safer memory allocation with
built-in overflow protection.

Similarly, Use array_size() instead of explicit multiplication for
'sensor->sensor_info->intervals.count * 2'.

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
v2:
Changed explicit multiplication 'sensor->sensor_info->intervals.count*2'
to use array_size().
---
 drivers/iio/common/scmi_sensors/scmi_iio.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/common/scmi_sensors/scmi_iio.c b/drivers/iio/common/scmi_sensors/scmi_iio.c
index da516c46e057..39c61c47022a 100644
--- a/drivers/iio/common/scmi_sensors/scmi_iio.c
+++ b/drivers/iio/common/scmi_sensors/scmi_iio.c
@@ -521,9 +521,9 @@ static int scmi_iio_set_sampling_freq_avail(struct iio_dev *iio_dev)
 	int i;
 
 	sensor->freq_avail =
-		devm_kzalloc(&iio_dev->dev,
-			     sizeof(*sensor->freq_avail) *
-				     (sensor->sensor_info->intervals.count * 2),
+		devm_kcalloc(&iio_dev->dev,
+			     array_size(sensor->sensor_info->intervals.count, 2),
+			     sizeof(*sensor->freq_avail),
 			     GFP_KERNEL);
 	if (!sensor->freq_avail)
 		return -ENOMEM;
@@ -597,8 +597,8 @@ scmi_alloc_iiodev(struct scmi_device *sdev,
 	iiodev->info = &scmi_iio_info;
 
 	iio_channels =
-		devm_kzalloc(dev,
-			     sizeof(*iio_channels) * (iiodev->num_channels),
+		devm_kcalloc(dev, iiodev->num_channels,
+			     sizeof(*iio_channels),
 			     GFP_KERNEL);
 	if (!iio_channels)
 		return ERR_PTR(-ENOMEM);
-- 
2.34.1