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Mon, 10 Feb 2025 02:52:12 -0800 (PST) From: Bartosz Golaszewski Date: Mon, 10 Feb 2025 11:52:01 +0100 Subject: [PATCH 7/8] gpiolib: sanitize the return value of gpio_chip::direction_input() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250210-gpio-sanitize-retvals-v1-7-12ea88506cb2@linaro.org> References: <20250210-gpio-sanitize-retvals-v1-0-12ea88506cb2@linaro.org> In-Reply-To: <20250210-gpio-sanitize-retvals-v1-0-12ea88506cb2@linaro.org> To: Linus Walleij , Bartosz Golaszewski Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2283; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=LPsmymBhAWix2fPGJHIO52f9SJsvYZKGQf0Il6uLLSI=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBnqdpT8oXiXz9TnBI1D2A6CzeHwMoqa/NdBW/TW 4K7Bj/U+4mJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZ6naUwAKCRARpy6gFHHX crh+EAC9LNr/MGK2bSbtPtqpnVNx1KGQ8xzgGhBILcBQg6u2n5w2cReBWOif7fVpn4TEEV3kqjZ 7HpF3DW/DbfyHCsVTtZVLhw6j8BXntb2UhDUUJSGnTBNK3vfW3MBESE72/PIuOZkCW0rVqVvPYa T+iXWydoCDKbPDpJVgzPcy0Bll2136Jeqi159psFDOrV/ggUQ2cO2IVmV+L7i9oJ+H6p4FjcPBK YJmjHcimq8oAx7mYShGy4YRQf39bssMIyjynccC/xki4cJ7uaqwfWY8umG2+NXSdQJP+k80Wp0D JmQmcsNHDVBiQbKfqnqHxUiq0x0sFDg042LghmXceMIrgVfRGSHpmfOu+aS97rCshyP6Uuk6oJ0 KX+Kw7YuBTqAumA6kH1Z4yYJgmOYoiBhC8t9wkB8aztwSlqEVWhZK/R1X/uYHOoYa4Ovz7AKLVx KmfQOEoI3/hLKRX3X7KmIw9GujO32FqOzFigBkFhYGSSfPnhDe+efIFTUgfIPujoYcKWKUEfC7z KjS1WwrlkuSSY4lzerZsU3EKKnYB8JRbuN6vYYHYvxe+yolnANFeWenny5+2Qhm7FHZE6Gxte4y iyTBXx5Q5rapDFGP+AxpxbktzdEHFaqN7+fIlirQiTYt+vpqkvkv/C+8AX57DL0+6XNcP3ViIjr xHfoFdPEJetQGRA== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski The return value of the direction_input() callback may be propagated to user-space. As per the API contract it can only return 0 or a negative error number. Add a wrapper around the callback calls that filters out anything else. Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 1f75ae6e208c..683a03d237c0 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2683,6 +2683,22 @@ int gpio_set_debounce_timeout(struct gpio_desc *desc= , unsigned int debounce) return ret; } =20 +static int gpiochip_direction_input(struct gpio_chip *gc, unsigned int off= set) +{ + int ret; + + lockdep_assert_held(&gc->gpiodev->srcu); + + if (WARN_ON(!gc->direction_input)) + return -EOPNOTSUPP; + + ret =3D gc->direction_input(gc, offset); + if (ret > 0) + ret =3D -EBADE; + + return ret; +} + static int gpiochip_direction_output(struct gpio_chip *gc, unsigned int of= fset, int value) { @@ -2751,8 +2767,8 @@ int gpiod_direction_input_nonotify(struct gpio_desc *= desc) * assume we are in input mode after this. */ if (guard.gc->direction_input) { - ret =3D guard.gc->direction_input(guard.gc, - gpio_chip_hwgpio(desc)); + ret =3D gpiochip_direction_input(guard.gc, + gpio_chip_hwgpio(desc)); } else if (guard.gc->get_direction) { ret =3D guard.gc->get_direction(guard.gc, gpio_chip_hwgpio(desc)); @@ -3448,7 +3464,7 @@ static void gpio_set_open_drain_value_commit(struct g= pio_desc *desc, bool value) return; =20 if (value) { - ret =3D guard.gc->direction_input(guard.gc, offset); + ret =3D gpiochip_direction_input(guard.gc, offset); } else { ret =3D gpiochip_direction_output(guard.gc, offset, 0); if (!ret) @@ -3479,7 +3495,7 @@ static void gpio_set_open_source_value_commit(struct = gpio_desc *desc, bool value if (!ret) set_bit(FLAG_IS_OUT, &desc->flags); } else { - ret =3D guard.gc->direction_input(guard.gc, offset); + ret =3D gpiochip_direction_input(guard.gc, offset); } trace_gpio_direction(desc_to_gpio(desc), !value, ret); if (ret < 0) --=20 2.45.2