gpiolib: sanitize the return value of gpio_chip::request()

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The return value of the request() callback may be propagated to
user-space. If a bad driver returns a positive number, it may confuse
user programs. Tighten the API contract and check for positive numbers
returned by GPIO controllers.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250210-gpio-sanitize-retvals-v1-2-12ea88506cb2@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

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Bartosz Golaszewski 2025-02-10 11:51:56 +01:00

parent 2d13f801f1

commit 69920338f8

2 changed files with 4 additions and 1 deletions

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2

drivers/gpio/gpiolib.c

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3

include/linux/gpio/driver.h

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