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Mon, 10 Feb 2025 02:52:05 -0800 (PST) From: Bartosz Golaszewski Date: Mon, 10 Feb 2025 11:51:55 +0100 Subject: [PATCH 1/8] gpiolib: check the return value of gpio_chip::get_direction() 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-v1-1-12ea88506cb2@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 , stable@vger.kernel.org X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2846; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=lpE55aITs3TR0edspV0JF4dj9P5jKU0BTQ+eUb+VBxg=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBnqdpSfnhhEUo6hT94zgAJgM2xjsjhsYO1vA+T0 5EoGpZakeGJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZ6naUgAKCRARpy6gFHHX cplCEAC9jg6cqsozxgAdfJBzUaYa+ZLzYNwuow+HZhV8fZDTTaaAyTUsXwiBvRP+WiPTHDehfMA GTEnGaHrEsFimr6T9IHElWUzybgmTrQRTW2MIfMUjxubcxckxHyPhJw97ErCdtUhfUll0OdXY+T ONyN3rJdZkz24OqcN422aTAdH4hKLyMfnv/w0s6x1K/gzsXlf6NyHmDDJh80JRkBMwzEsL6YbO9 B65JKmxa0gBdnI36HYvYDHPs9QZAMlae0WzAVFzHQRmrNj+pdk932spDIFUwyLCnZC1Ar23KCda nbCd0PS4/DgSK1OaEgMamD7jguHCwyF7LIzDou2alhSCWukW4KjO714XP9w7gBWN32YaIibeUyY BRX9blIl4eQGtj78PdDvri2lAVfEMT/4rutTNEruVsle+9EPDKf0RsqlnESe4ooJyD3qQZBgo1+ Gt1eRnBrGe64Id35RqFhIjNgeUroDx7+kGRocsobPWoonDCs9FzDKNiNEpqJEoK5VGlQrZq4+Kf 1ANNV39UumMhSktuLvFaYeAXjeDgn5ceL3WtGchzDRLIbkEhKuHrvn+PoKWQPGnnWcQG7uPH5xq j3SFVEy6JfpgAbpdwr1FHdgvOpP/3jLtNRQHVZ42v2G0mi29Z+9X5cPEDcgXYdwNsrZc1Y5hViP xYbtXvwIj1LkIIQ== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski As per the API contract - gpio_chip::get_direction() may fail and return a negative error number. However, we treat it as if it always returned 0 or 1. Check the return value of the callback and propagate the error number up the stack. Cc: stable@vger.kernel.org Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib.c | 44 +++++++++++++++++++++++++++++--------------- 1 file changed, 29 insertions(+), 15 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 679ed764cb14..5d3774dc748b 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1057,8 +1057,11 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc,= void *data, desc->gdev =3D gdev; =20 if (gc->get_direction && gpiochip_line_is_valid(gc, desc_index)) { - assign_bit(FLAG_IS_OUT, - &desc->flags, !gc->get_direction(gc, desc_index)); + ret =3D gc->get_direction(gc, desc_index); + if (ret < 0) + goto err_cleanup_desc_srcu; + + assign_bit(FLAG_IS_OUT, &desc->flags, !ret); } else { assign_bit(FLAG_IS_OUT, &desc->flags, !gc->direction_input); @@ -2728,13 +2731,18 @@ int gpiod_direction_input_nonotify(struct gpio_desc= *desc) if (guard.gc->direction_input) { ret =3D guard.gc->direction_input(guard.gc, gpio_chip_hwgpio(desc)); - } else if (guard.gc->get_direction && - (guard.gc->get_direction(guard.gc, - gpio_chip_hwgpio(desc)) !=3D 1)) { - gpiod_warn(desc, - "%s: missing direction_input() operation and line is output\n", - __func__); - return -EIO; + } else if (guard.gc->get_direction) { + ret =3D guard.gc->get_direction(guard.gc, + gpio_chip_hwgpio(desc)); + if (ret < 0) + return ret; + + if (ret !=3D GPIO_LINE_DIRECTION_IN) { + gpiod_warn(desc, + "%s: missing direction_input() operation and line is output\n", + __func__); + return -EIO; + } } if (ret =3D=3D 0) { clear_bit(FLAG_IS_OUT, &desc->flags); @@ -2771,12 +2779,18 @@ static int gpiod_direction_output_raw_commit(struct= gpio_desc *desc, int value) gpio_chip_hwgpio(desc), val); } else { /* Check that we are in output mode if we can */ - if (guard.gc->get_direction && - guard.gc->get_direction(guard.gc, gpio_chip_hwgpio(desc))) { - gpiod_warn(desc, - "%s: missing direction_output() operation\n", - __func__); - return -EIO; + if (guard.gc->get_direction) { + ret =3D guard.gc->get_direction(guard.gc, + gpio_chip_hwgpio(desc)); + if (ret < 0) + return ret; + + if (ret !=3D GPIO_LINE_DIRECTION_OUT) { + gpiod_warn(desc, + "%s: missing direction_output() operation\n", + __func__); + return -EIO; + } } /* * If we can't actively set the direction, we are some --=20 2.45.2