linux-kernel - [PATCH] pinctrl: nuvoton: wpcm450: fix out of bounds write

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Message-ID: <20230825101532.6624-1-m.kobuk@ispras.ru>
Date:   Fri, 25 Aug 2023 13:15:28 +0300
From:   Mikhail Kobuk <m.kobuk@...ras.ru>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     Mikhail Kobuk <m.kobuk@...ras.ru>,
        Linus Walleij <linus.walleij@...aro.org>,
        openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>
Subject: [PATCH] pinctrl: nuvoton: wpcm450: fix out of bounds write

Write into 'pctrl->gpio_bank' happens before the check for GPIO index
validity, so out of bounds write may happen.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: a1d1e0e3d80a ("pinctrl: nuvoton: Add driver for WPCM450")
Signed-off-by: Mikhail Kobuk <m.kobuk@...ras.ru>
Reviewed-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/pinctrl/nuvoton/pinctrl-wpcm450.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
index 2d1c1652cfd9..8a9961ac8712 100644
--- a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
+++ b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
@@ -1062,13 +1062,13 @@ static int wpcm450_gpio_register(struct platform_device *pdev,
 		if (ret < 0)
 			return ret;
 
-		gpio = &pctrl->gpio_bank[reg];
-		gpio->pctrl = pctrl;
-
 		if (reg >= WPCM450_NUM_BANKS)
 			return dev_err_probe(dev, -EINVAL,
 					     "GPIO index %d out of range!\n", reg);
 
+		gpio = &pctrl->gpio_bank[reg];
+		gpio->pctrl = pctrl;
+
 		bank = &wpcm450_banks[reg];
 		gpio->bank = bank;
 
-- 
2.42.0