From: Kent Gibson Date: Mon, 9 Sep 2019 03:24:06 +0000 (+0000) Subject: gpio: fix line flag validation in lineevent_create X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5ca2f54b597c816df54ff1b28eb99cf7262b955d;p=linux.git gpio: fix line flag validation in lineevent_create lineevent_create should not allow any of GPIOHANDLE_REQUEST_OUTPUT, GPIOHANDLE_REQUEST_OPEN_DRAIN or GPIOHANDLE_REQUEST_OPEN_SOURCE to be set. Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines") Cc: stable Signed-off-by: Kent Gibson Signed-off-by: Bartosz Golaszewski --- diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 7502230a4ec8a..d9074191edef4 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -934,7 +934,9 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) } /* This is just wrong: we don't look for events on output lines */ - if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { + if ((lflags & GPIOHANDLE_REQUEST_OUTPUT) || + (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || + (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)) { ret = -EINVAL; goto out_free_label; } @@ -948,10 +950,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) set_bit(FLAG_ACTIVE_LOW, &desc->flags); - if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) - set_bit(FLAG_OPEN_DRAIN, &desc->flags); - if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) - set_bit(FLAG_OPEN_SOURCE, &desc->flags); ret = gpiod_direction_input(desc); if (ret)