diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-09-16 11:46:23 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-10-01 12:07:21 +0200 |
| commit | bcc6d99ac913e3115cfa564534c432b950408e21 (patch) | |
| tree | a0ddcd57a3e130a8db2754f6977862a30330696b /drivers/gpio | |
| parent | c8f3d144004dd3f471ffd414690d15a005e4acd6 (diff) | |
gpiolib: sanitize flags before allocating memory in lineevent_create()
Move all the flags sanitization before any memory allocation in
lineevent_create() in order to remove a couple unneeded gotos.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 42 |
1 files changed, 18 insertions, 24 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index bdbc1649eafa..e8964493c571 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -894,6 +894,24 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) if (copy_from_user(&eventreq, ip, sizeof(eventreq))) return -EFAULT; + offset = eventreq.lineoffset; + lflags = eventreq.handleflags; + eflags = eventreq.eventflags; + + if (offset >= gdev->ngpio) + return -EINVAL; + + /* Return an error if a unknown flag is set */ + if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || + (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) + return -EINVAL; + + /* This is just wrong: we don't look for events on output lines */ + if ((lflags & GPIOHANDLE_REQUEST_OUTPUT) || + (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || + (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)) + return -EINVAL; + le = kzalloc(sizeof(*le), GFP_KERNEL); if (!le) return -ENOMEM; @@ -911,30 +929,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) } } - offset = eventreq.lineoffset; - lflags = eventreq.handleflags; - eflags = eventreq.eventflags; - - if (offset >= gdev->ngpio) { - ret = -EINVAL; - goto out_free_label; - } - - /* Return an error if a unknown flag is set */ - if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || - (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { - ret = -EINVAL; - goto out_free_label; - } - - /* This is just wrong: we don't look for events on output lines */ - if ((lflags & GPIOHANDLE_REQUEST_OUTPUT) || - (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || - (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)) { - ret = -EINVAL; - goto out_free_label; - } - desc = &gdev->descs[offset]; ret = gpiod_request(desc, le->label); if (ret) |