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Date:   Thu, 20 Jan 2022 16:52:43 -0600
From:   "Gustavo A. R. Silva" <>
To:     Jonathan Cameron <>,
        Lars-Peter Clausen <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] iio: hw_consumer: Use struct_size() helper in kzalloc()

Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.

Also, address the following sparse warnings:
drivers/iio/buffer/industrialio-hw-consumer.c:63:23: warning: using sizeof on a flexible structure

Signed-off-by: Gustavo A. R. Silva <>
 drivers/iio/buffer/industrialio-hw-consumer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/buffer/industrialio-hw-consumer.c b/drivers/iio/buffer/industrialio-hw-consumer.c
index 87d9aabd20c7..fb58f599a80b 100644
--- a/drivers/iio/buffer/industrialio-hw-consumer.c
+++ b/drivers/iio/buffer/industrialio-hw-consumer.c
@@ -52,7 +52,6 @@ static const struct iio_buffer_access_funcs iio_hw_buf_access = {
 static struct hw_consumer_buffer *iio_hw_consumer_get_buffer(
 	struct iio_hw_consumer *hwc, struct iio_dev *indio_dev)
-	size_t mask_size = BITS_TO_LONGS(indio_dev->masklength) * sizeof(long);
 	struct hw_consumer_buffer *buf;
 	list_for_each_entry(buf, &hwc->buffers, head) {
@@ -60,7 +59,8 @@ static struct hw_consumer_buffer *iio_hw_consumer_get_buffer(
 			return buf;
-	buf = kzalloc(sizeof(*buf) + mask_size, GFP_KERNEL);
+	buf = kzalloc(struct_size(buf, scan_mask, BITS_TO_LONGS(indio_dev->masklength)),
+		      GFP_KERNEL);
 	if (!buf)
 		return NULL;

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