Input: check keycodesize when adjusting keymaps

When changing key mappings we need to make sure that the new
keycode value can be stored in dev->keycodesize bytes.

Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 374f404e81da..20e3a165989f 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -320,6 +320,7 @@ static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
                         if (get_user(v, ip + 1)) return -EFAULT;
                         if (v < 0 || v > KEY_MAX) return -EINVAL;
+                        if (v >> (dev->keycodesize * 8)) return -EINVAL;
                         u = SET_INPUT_KEYCODE(dev, t, v);
                         clear_bit(u, dev->keybit);
                         set_bit(v, dev->keybit);