linux-kernel - [PATCH v3 2/2] iio: adc: tsc2046: add sanity check to avoid to big allocations

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Date:   Mon, 17 Jan 2022 09:28:52 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>,
        Robin van der Gracht <robin@...tonic.nl>,
        linux-iio@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH v3 2/2] iio: adc: tsc2046: add sanity check to avoid to big allocations

To avoid problematic devicetree configurations. Set allocation limit
with error message and suggestion on what can be done to solve this
issue.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/iio/adc/ti-tsc2046.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iio/adc/ti-tsc2046.c b/drivers/iio/adc/ti-tsc2046.c
index 95771ceba206..55b35570ad8b 100644
--- a/drivers/iio/adc/ti-tsc2046.c
+++ b/drivers/iio/adc/ti-tsc2046.c
@@ -679,6 +679,12 @@ static int tsc2046_adc_setup_spi_msg(struct tsc2046_adc_priv *priv)
 	for (ch_idx = 0; ch_idx < ARRAY_SIZE(priv->l); ch_idx++)
 		size += tsc2046_adc_group_set_layout(priv, ch_idx, ch_idx);
 
+	if (size > PAGE_SIZE) {
+		dev_err(&priv->spi->dev,
+			"Calculated scan buffer is too big. Try to reduce spi-max-frequency, settling-time-us or oversampling-ratio\n");
+		return -ENOSPC;
+	}
+
 	priv->tx = devm_kzalloc(&priv->spi->dev, size, GFP_KERNEL);
 	if (!priv->tx)
 		return -ENOMEM;
-- 
2.30.2