lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-Id: <b9e7fbdb52adee6602b86e0771c6e26f35e21ac4.1513591276.git.christophe.leroy@c-s.fr> Date: Mon, 18 Dec 2017 11:08:31 +0100 (CET) From: Christophe Leroy <christophe.leroy@....fr> To: Linus Walleij <linus.walleij@...aro.org> Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org Subject: [PATCH 2/4] gpio: sysfs: correct error handling on 'value' attribute read. 'value' attribute is supposed to only return 0 or 1 according to the documentation. With today's implementation, if gpiod_get_value_cansleep() fails the printed 'value' is a negative value. This patch ensures that an error is returned on read instead. Signed-off-by: Christophe Leroy <christophe.leroy@....fr> --- drivers/gpio/gpiolib-sysfs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 7a3f4271393b..1b0f415df03b 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -106,8 +106,12 @@ static ssize_t value_show(struct device *dev, mutex_lock(&data->mutex); - status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc)); + status = gpiod_get_value_cansleep(desc); + if (status < 0) + goto err; + status = sprintf(buf, "%d\n", status); +err: mutex_unlock(&data->mutex); return status; -- 2.13.3
Powered by blists - more mailing lists