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pinctrl: nuvoton: wpcm450: fix out of bounds write

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[ Upstream commit 87d315a341 ]

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: a1d1e0e3d8 ("pinctrl: nuvoton: Add driver for WPCM450")
Signed-off-by: Mikhail Kobuk <m.kobuk@ispras.ru>
Reviewed-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20230825101532.6624-1-m.kobuk@ispras.ru
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mikhail Kobuk 2023-08-25 13:15:28 +03:00 committed by Greg Kroah-Hartman
parent 37157830a9
commit 6c18c386fd
1 changed files with 3 additions and 3 deletions
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6
drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
View file

@ -1041,13 +1041,13 @@ 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;