diff options
| author | Kent Gibson <warthog618@gmail.com> | 2019-09-09 03:24:06 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-21 07:14:04 +0200 |
| commit | c166e7dc7db7c6a58a8d23393aaed0e78475efb5 (patch) | |
| tree | 998a98d7ac60dcf37bdcdf6d5be1a9a8e70ae4df | |
| parent | 71bbfc9042e9226cf10f129a2b28a89ba3c00c80 (diff) | |
gpio: fix line flag validation in lineevent_create
commit 5ca2f54b597c816df54ff1b28eb99cf7262b955d upstream.
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 <stable@vger.kernel.org>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 0ca8f3ec82b1..6008a30a17d0 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -797,7 +797,9 @@ 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; } @@ -811,10 +813,6 @@ 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) |