linux-kernel - [PATCH 03/13] bus: ts-nbus: validate ts,data-gpios array size

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Message-Id: <20250131-gpio-set-array-helper-v1-3-991c8ccb4d6e@baylibre.com>
Date: Fri, 31 Jan 2025 14:24:43 -0600
From: David Lechner <dlechner@...libre.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Andy Shevchenko <andy@...nel.org>, 
 Geert Uytterhoeven <geert@...ux-m68k.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>, 
 Peter Rosin <peda@...ntia.se>, Andrew Lunn <andrew@...n.ch>, 
 Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-iio@...r.kernel.org, linux-mmc@...r.kernel.org, 
 netdev@...r.kernel.org, linux-phy@...ts.infradead.org, 
 linux-sound@...r.kernel.org, David Lechner <dlechner@...libre.com>
Subject: [PATCH 03/13] bus: ts-nbus: validate ts,data-gpios array size

Add validation of ts,data-gpios array size during probe. The driver
later hard-codes 8 as the size of the array when using it, so we should
be validating that the array is actually that big to prevent possible
out of bounds accesses.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/bus/ts-nbus.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 2328c48b9b1260e805c631f2aa7379d620084537..d3ee102a13893c83c50e41f7298821f4d7ae3487 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -48,6 +48,10 @@ static int ts_nbus_init_pdata(struct platform_device *pdev,
 		return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->data),
 				     "failed to retrieve ts,data-gpio from dts\n");

+	if (ts_nbus->data->ndescs != 8)
+		return dev_err_probe(&pdev->dev, -EINVAL,
+				     "invalid number of ts,data-gpios\n");
+
 	ts_nbus->csn = devm_gpiod_get(&pdev->dev, "ts,csn", GPIOD_OUT_HIGH);
 	if (IS_ERR(ts_nbus->csn))
 		return dev_err_probe(&pdev->dev, PTR_ERR(ts_nbus->csn),

-- 
2.43.0